Why is the CHP unit not starting? Fault diagnosis and causes | Stromfeemeta name="description" content="Why is the generator set (CHP) not starting? Fault diagnosis and causes. Common causes: gas pressure below 20 mbar, safety chain not closed (Emergency Stop, door contacts), faulty ignition, flat starter battery, tripped"> <link rel="canonical" href="https://stromfee-mauritius.ai/en/glaesern/cogeneration/wizards/frage_gasdruck_startversager/"> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "Article", "headline": "Why is the CHP unit not starting? Fault diagnosis and causes", "mainEntityOfPage": "/glaesern/cogeneration/wizards/frage_gasdruck_startversager.html", "description": "Common causes: Gas pressure below 20 mbar, safety chain not closed (Emergency Stop, door contacts), defective ignition, empty starter battery, triggered grid protection or too low oil level — PLC status"}</script> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What is the most common cause of a CHP startup error?", "acceptedAnswer": {"@type": "Answer", "text": "It is generally due to gas pressure that is too low (below 20 mbar) or a safety chain interrupted by open door contacts."}}, {"@type": "Question", "name": "Why does the CHP unit not show a start even though the gas pressure is correct?", "acceptedAnswer": {"@type": "Answer", "text": "In this case, the electrical safety chain must be checked or the battery voltage for the starter must be checked."}}, {"@type": "Question", "name": "From what threshold must the gas pressure be for a safe start?", "acceptedAnswer": {"@type": "Answer", "text": "A stable gas pressure above 20 mbar is technically necessary to support the ignition process."}}, {"@type": "Question", "name": "How to identify a faulty ignition on the CHP unit?", "acceptedAnswer": {"@type": "Answer", "text": "An error message in the status word of the PLC or insufficient electrical arc in the presence of gas indicates defects on the ignition electrodes."}}, {"@type": "Question", "name": "Why does the CHP unit stop immediately after starting?", "acceptedAnswer": {"@type": "Answer", "text": "This often indicates activated grid protection, oil temperature that is too low, or an unstable gas flow."}}, {"@type": "Question", "name": "What is the impact of a weak battery on the startup process?", "acceptedAnswer": {"@type": "Answer", "text": "A voltage lower than 12V can lead to the interruption of the startup process by the control system or prevent the engine from starting with sufficient torque."}}]}</script> <style>:root{--bg:#fdfcff;--bg-soft:#faf8ff;--surface:#fff;--text:#1d1d1f;--text-2:#515154;--text-3:#86868b;--border:#fed7aa;--border-soft:#efeaf8;--accent:#f97316;--accent-bright:#fdba74;--accent-dim:rgba(234,88,12,.08);--emerald:#ea580c;--font:'Inter',-apple-system,sans-serif;--mono:'JetBrains Mono',monospace;--radius:16px}*{box-sizing:border-box;margin:0;padding:0} body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6; -webkit-font-smoothing:antialiased} .wrap{max-width:1080px;margin:0 auto;padding:0 24px} header{padding:14px 0;border-bottom:1px solid var(--border-soft);background:rgba(255,255,255,.72); backdrop-filter:saturate(180%) blur(20px);position:sticky;top:0;z-index:9} header a{color:var(--text-2);text-decoration:none;font-size:13px;margin-right:18px} header a:hover{color:var(--accent)} .hero{padding:56px 0 32px} 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auto;width:22px;height:22px;border-radius:999px;background:var(--accent-dim);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.8rem;margin-top:.05rem} .wiz-nav{display:flex;justify-content:space-between;align-items:center;gap:.8rem;margin-top:1.5rem;flex-wrap:wrap} .wiz-back{background:none;border:0;color:var(--text-3,#86868b);font-weight:700;font-size:.95rem;cursor:pointer;padding:.6rem .2rem} .wiz-back:hover{color:var(--text,#1d1d1f)} .wiz-next{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;border:0;border-radius:999px;padding:.85rem 1.6rem;font-weight:800;font-size:1rem;cursor:pointer;box-shadow:0 10px 26px rgba(249,115,22,.28);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem} .wiz-next:hover{transform:translateY(-1px)} .benefit{background:linear-gradient(135deg,#fff7f0,#fff);border:1px solid var(--accent-ultra);border-radius:18px;padding:1.3rem 1.4rem;margin:.2rem 0 1.1rem} .benefit h3{margin:0 0 .5rem;font-size:1.2rem;font-weight:800;color:var(--text,#1d1d1f)} .benefit p{margin:0;color:var(--text-2,#515154);line-height:1.6}</style></head><body> <header class="site"><div class="wrap navrow"> <a class="brand" href="/glaesern/">◈ Transparent CHP</a> <nav class="nlinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/gasstrecke.html">Gas line</a></nav> <a class="navcta" href="#kontakt">Installation check →</a></div></header> <div class="hero-w"><h1>CHP does not start – why?</h1><p>Component assistant · Gas line</p> <div class="livebar"><span class="livedot"></span><b id="lcount2">…</b>Live measured values from the plant ·<span id="lts2"> verbinde… </span></div></div> <div class="wiz-wrap"> <div id="steps"> <div class="st" data-s="1"><span class="no">1</span> Comprendre </div> <div class="st" data-s="2"><span class="no">2</span>View live</div> <div class="st" data-s="3"><span class="no">3</span>What AI does</div> <div class="st" data-s="4"><span class="no">4</span>Your benefit</div> </div> <div id="body"></div> </div> <div class="sec"><h2>Diagram — Process & sensors live</h2><p class="lead">The path through the domain, with the actual measurement points of the installation.</p><svg viewBox="0 0 920 300" style="width:100%;height:auto;background:#fdfcff;border:1px solid #fed7aa;border-radius:16px"><defs><linearGradient id="bx" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#fff"/><stop offset="1" stop-color="#fff7ed"/></linearGradient><marker id="ar" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#f97316"/></marker></defs><text x="20" y="30" font-size="14" font-weight="800" fill="#ea580c">Gas line — Process diagram</text><text x="20" y="48" font-size="10.5" fill="#86868b">orange = live sensor of the installation · flow from left to right</text><line x1="138" y1="152" x2="268" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="392" y1="152" x2="522" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="646" y1="152" x2="776" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><g><rect x="20" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="79" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Gas pipeline</text></g><g><rect x="274" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="333" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"><tspan x="333" dy="-4"></tspan><tspan x="333" dy="14">Gas regulation circuit</tspan></text><text x="333" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Pression </text></g><g><rect x="528" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="587" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Gas mixer</text><text x="587" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Air+Gaz </text></g><g><rect x="782" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="841" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Engine inlet</text></g><line x1="79" y1="120" x2="79" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="79" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(79,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">Gas quantity</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rgasmenge" data-u="m³/h">…</text></g><line x1="333" y1="120" x2="333" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="333" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(333,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">Filling level</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2regel_riwgasfuellstmw" data-u="%">…</text></g><line x1="587" y1="120" x2="587" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="587" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(587,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b"> Mélangeur </text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rgasmischer_pos" data-u="%">…</text></g></svg></div> <div class="sec"><div class="block"><h3>Thus we connect — read only</h3><p class="step-p">The value comes from<b>Modbus TCP · Plant PLC · M-Bus (meters)</b>of the installation —<b>read, not controlled</b>. Everything is<b>in the house</b>calculated, nothing leaves the house. No obligation to disclose operating data.</p></div><div class="block"><h3>Your own LLM for CHP — offline</h3><p class="step-p">Questions in plain language, answered by<b>Your own installation data</b>— local, no cloud. The AI runs internally; the installation remains yours.</p></div><div class="note"><b>Regulatory framework:</b>DVGW G 260 (gas quality) · DVGW G 262 (biogas injection)</div><div class="block"><h3>Associated causal chains</h3><p class="step-p">This component is part of<a href="https://bhkw-anlagen.com/kausalketten.html" style="color:var(--accent)">Installation causal chains</a>— from cause to effect (gas quality → engine → exhaust gas → heat → efficiency). The AI reads the entire chain, not just the individual value.</p></div><div class="block"><h3>Link with the entire installation</h3><p class="step-p">A CHP unit is never alone: electricity, heat and gas are linked, and with PV and battery storage, it becomes a system. The AI calculates the entire installation.</p><div style="display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.6rem"><a href="/glaesern/cogeneration/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Transparent BESS →</a><a href="/glaesern/hotel/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Gläsernes Hotel →</a><a href="/fr/pv-watcher/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">PV-Watcher →</a></div></div></div><div class="sec faqsec"><h2>Frequently asked questions</h2><details><summary>What is the most common cause of a CHP startup error?</summary><div class="faq-a">It is usually too low gas pressure (below 20 mbar) or a safety chain interrupted by open door contacts.</div></details><details><summary>Why does the CHP not show a start even though the gas pressure is correct?</summary><div class="faq-a">In this case, the electrical safety chain must be checked or the battery voltage for the starter must be checked.</div></details><details><summary>What threshold must the gas pressure be at for a safe start?</summary><div class="faq-a">A stable gas pressure above 20 mbar is technically necessary to support the ignition process.</div></details><details><summary>How to recognise a faulty ignition on the CHP?</summary><div class="faq-a">An error message in the status word of the PLC (SPS) or insufficient electrical arc in the presence of gas indicates defects on the ignition electrodes.</div></details><details><summary>Why does the CHP stop immediately after starting?</summary><div class="faq-a">This often indicates an activated grid protection, too low oil temperature or unstable gas flow.</div></details><details><summary>What is the impact of a low battery on the startup process?</summary><div class="faq-a">A voltage lower than 12V can lead to the interruption of the startup process by the control system or prevent the engine from starting with sufficient torque.</div></details></div> <footer class="site"><div class="wrap"> <div class="fbrand">◈ Transparent CHP</div> <p class="fclaim">Connected in read-only mode · local calculation · no cloud. The installation remains at your site.</p> <nav class="flinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/gasstrecke.html">Gas line</a> <a href="https://bhkw-anlagen.com/impressum.html">Legal notice</a> <a href="https://bhkw-anlagen.com/datenschutz.html">Data protection</a></nav> <div class="fcopy">© 2026 HR Energiemanagement GmbH · 32257 Bünde · +49 5223 4921030</div> </div></footer> <script> var state={step:1}; function li(t){return '<li>'+t+'</li>';} function nav(s){var b=s>1?'<button class="wiz-back" onclick="go('+(s-1)+')">← Back</button>':'<span></span>'; var n=s<4?'<button class="wiz-next" onclick="go('+(s+1)+')">Next →</button>':'<button class="wiz-next" onclick="go(1)">From the beginning</button>'; return '<div class="wiz-nav">'+b+n+'</div>';} function step1(){return '<div class="step-grid"><img class="step-img" src="../img/frage_gasdruck_startversager.jpg" alt="CHP fails to start – what\'s the cause?">'+ '<div><p class="step-kicker">Step 1 · Understand</p><h2 class="step-h">What is "CHP fails to start – what\'s the cause?"?</h2>'+ '<p class="step-p">Common causes: gas pressure below 20 mbar, safety chain not closed (emergency stop, door contacts), faulty ignition, empty starter battery, tripped grid protection or too low oil level — the PLC status word provides the first clue.</p></1></div>'+nav(1);} function step2(){return '<p class="step-kicker">Step 2 · See live</p><h2 class="step-h">The plant — right now</h2><div class="live-head"><span class="livedot"></span><span class="live-status" id="lstatus"> connecting... </span><span class="live-sub">· anonymous reference plant · read-only from the process control system, calculated in-house</span></div><div class="kpis"><div class="kpi hl" data-k="sbhkw2_rgasmenge"><div class="kl"> Gas quantity </div><div class="kval"><span class="v">…</span><span class="ku">m³/h</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_rgasmischer_pos"><div class="kl"> Gas mixer </div><div class="kval"><span class="v">…</span><span class="ku">%</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2regel_riwgasfuellstmw"><div class="kl">Gas level</div><div class="kval"><span class="v">…</span><span class="ku">%</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_rladedruck"><div class="kl">Charge pressure</div><div class="kval"><span class="v">…</span><span class="ku">bar</span></div><div class="spark"></div></div></div><p class="step-p" style="margin-top:1rem">Excerpt from <b id="lcount">…</b> plant measurements. For the detailed <a href="https://bhkw-anlagen.com/erklaervideo/frage_gasdruck_startversager.html" style="color:var(--accent)">explanation page with video →</a></p>'+nav(2);} function step3(){return '<div class="step-grid"><div><p class="step-kicker">Step 3 · What the AI does</p>'+ '<h2 class="step-h">What the AI reads from these values</h2><ul class="chk">'+li('Gas pressure below 20 mbar (<b>Under-supply</b> causes interruption of the start cycle)')+li('Safety chain open (<b>Emergency stop or door contacts</b> interrupt the circuit)')+li('Faulty ignition or <b>ignition electrode error</b>')+li('Low oil level or <b>battery voltage < 12V</b>')+'</ul></div>'+ '<img class="step-img" src="../img/ki-gasstrecke.jpg" alt="AI monitoring"></div>'+ '<div class="szen szen-grid"><img class="szen-img" src="../img/szen-gasstrecke.jpg" alt="Scenario" loading="lazy"><div><p class="mon">Monitored: continuously · Pressure, methane content, fill level</p>'+ '<p class="step-p"><b>The scenario:</b> the amount of methane decreases slowly, the engine begins to knock without an alarm, leading to power loss and wear.<br>'+ '<b>The AI:</b> identifies the quality trend early and reports it before the knocking causes damage. <b>It detects the trend before the limit value is reached.</b></p></div></div>'+nav(3);} function step4(){return '<p class="step-kicker">Step 4 · Your benefit</p><h2 class="step-h">Why this is important</h2>'+ '<div class="benefit"><h3>Rapid identification of the cause of failure minimizes downtime and prevents damage to ignition components.</h3><p>Monitoring the gas pressure (reference value approx. 255.7) and the safety chain enables proactive maintenance. A clear error message in the PLC status word significantly reduces troubleshooting by technicians.</p></div>'+ '<div class="calcbox"><p class="step-p">Gas quantity (m³/h) <input id="c0" type="number" step="any" value="200" oninput="r()"> · Methane content (%) <input id="c1" type="number" step="any" value="52" oninput="r()"> → <b><span id="o" style="color:var(--accent)">—</span> kWh/h</b></p>'+ '<p class="mon" style="margin-top:.5rem">Calculation path: Gas quantity × Methane content × 9.97 kWh/m³ (Methane calorific value)</p></div>'+nav(4);} function r(){var v=[];for(var i=0;i<2;i++){var e=document.getElementById('c'+i);v.push(e?parseFloat(e.value)||0:0);}'o');if(o)o.textContent=(Math.round(res*100)/100).toLocaleString('de-DE');}'body').innerHTML=state.step===1?step1():state.step===2?step2():state.step===3?step3():step4();'#steps .st').forEach(function(el){var n=+el.getAttribute('data-s');el.classList.toggle('on',n===state.step);el.classList.toggle('done',n<state.step);});'smooth'});} document.querySelectorAll('#steps .st').forEach(function(el){el.style.cursor='pointer';el.onclick=function(){go(+el.getAttribute('data-s'));};});'https://bhkw-anlagen.com/data/sensor-live.json',HURL='https://bhkw-anlagen.com/data/sensor-history.json',LKEY='sbhkw2_rgasmenge',LIVEDATA=null,HISTDATA=null;function fmtAge(a){return a<90?('vor '+a+' s'):('vor '+Math.round(a/60)+' min');}function fmt(v){return (typeof v==='number')?(Math.round(v*100)/100).toLocaleString('de-DE'):v;}function spark(el,ser){if(!ser||!ser.length)return;var nz=ser.filter(function(x){return x!==0;});if(nz.length<2){el.innerHTML='';return;}var mn=Math.min.apply(0,ser),mx=Math.max.apply(0,ser),rg=(mx-mn)||1;var n=ser.length,w=100,h=26,pts=ser.map(function(y,i){return (i/(n-1)*w).toFixed(1)+','+(h-2-(y-mn)/rg*(h-4)).toFixed(1);}).join(' ');el.innerHTML='<svg viewBox=\'0 0 '+w+' '+h+'\' preserveAspectRatio=\'none\' style=\'width:100%;height:100%\'>'+'<polyline fill=\'none\' stroke=\'#f97316\' stroke-width=\'1.5\' points=\''+pts+'\'/></svg>';}window.__fillLive=function(){var d=LIVEDATA;if(!d)return;var c=d.count||Object.keys(d.sensors||{}).length;var e=document.getElementById('lcount2');if(e)e.textContent=c;var e2=document.getElementById('lcount');if(e2)e2.textContent=c;var st=document.getElementById('lstatus');document.querySelectorAll('.kpi[data-k]').forEach(function(card){var k=card.dataset.k;var s=d.sensors&&d.sensors[k];var vel=card.querySelector('.v');if(s&&vel)vel.textContent=fmt(s.v);if(HISTDATA&&HISTDATA.sensors){spark(card.querySelector('.spark'),HISTDATA.sensors[k]);}});document.querySelectorAll('.svlive[data-k]').forEach(function(el){var k=el.dataset.k;var s=d.sensors&&d.sensors[k];if(s)el.textContent=fmt(s.v)+(el.dataset.u?(' '+el.dataset.u):'');});var s0=d.sensors&&d.sensors[LKEY];if(st)st.textContent=(s0?('Anlage läuft · '+fmtAge(s0.age||0)):'Anlage');var t2=document.getElementById('lts2');if(t2)t2.textContent='aktualisiert '+fmtAge((s0&&s0.age)||0);var lv=document.getElementById('lv');if(lv&&s0){lv.textContent=fmt(s0.v)+(s0.u?(' '+s0.u):'');}var ll=document.getElementById('ll');if(ll&&s0)ll.textContent=s0.l||LKEY;var lt=document.getElementById('lts');if(lt&&s0)lt.textContent='Stand '+(s0.ts||'')+' · '+fmtAge(s0.age||0);};function pullLive(){fetch(LURL,{cache:'no-store'}).then(function(r){return r.json();}).then(function(d){LIVEDATA=d;window.__fillLive();}).catch(function(){var t=document.getElementById('lstatus');if(t)t.textContent='Live nicht erreichbar';});}if(HURL){fetch(HURL,{cache:'no-store'}).then(function(r){return r.json();}).then(function(d){HISTDATA=d;window.__fillLive();}).catch(function(){});}pullLive();setInterval(pullLive,30000); </script></body></html>