https://jme-training-academy.com/index.php?action=history&feed=atom&title=Combi_Boiler_Control_Wiring_Reference_PackCombi Boiler Control Wiring Reference Pack - Revision history2026-06-15T12:09:04ZRevision history for this page on the wikiMediaWiki 1.45.3https://jme-training-academy.com/index.php?title=Combi_Boiler_Control_Wiring_Reference_Pack&diff=29&oldid=prevMorgan Allen: Created page with "= Combi Boiler Electrical Control Wiring Reference = == Overview == Combi systems do not require external hot water control. Heating demand is sent directly to the boiler. == Main Components == * Combi boiler * Room thermostat or smart thermostat * Optional external programmer * Fused spur supply * Boiler control terminals (heating demand input) --- == System Operation == * Boiler fires when it receives a heating demand signal. * No cylinder or zone valves required...."2026-06-10T14:10:15Z<p>Created page with "= Combi Boiler Electrical Control Wiring Reference = == Overview == Combi systems do not require external hot water control. Heating demand is sent directly to the boiler. == Main Components == * Combi boiler * Room thermostat or smart thermostat * Optional external programmer * Fused spur supply * Boiler control terminals (heating demand input) --- == System Operation == * Boiler fires when it receives a heating demand signal. * No cylinder or zone valves required...."</p>
<p><b>New page</b></p><div>= Combi Boiler Electrical Control Wiring Reference =<br />
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== Overview ==<br />
Combi systems do not require external hot water control. Heating demand is sent directly to the boiler.<br />
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== Main Components ==<br />
* Combi boiler<br />
* Room thermostat or smart thermostat<br />
* Optional external programmer<br />
* Fused spur supply<br />
* Boiler control terminals (heating demand input)<br />
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== System Operation ==<br />
* Boiler fires when it receives a heating demand signal.<br />
* No cylinder or zone valves required.<br />
* Internal diverter valve controls hot water production.<br />
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== Wiring Concept ==<br />
* Thermostat switches heating demand input on boiler<br />
* Boiler provides internal control logic<br />
* Live supply via fused spur<br />
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== Key Wiring Points ==<br />
* Permanent live and neutral supply to boiler<br />
* Switched live from thermostat/programmer to demand terminal<br />
* Earth continuity mandatory<br />
* Smart thermostats may require receiver module<br />
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== Common Fault Areas ==<br />
* No heating demand signal<br />
* Incorrect thermostat compatibility<br />
* Boiler not receiving switched live<br />
* Incorrect link terminals left in place<br />
* Faulty receiver module (smart controls)<br />
* Loose connections at boiler terminals<br />
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== Notes ==<br />
* Always check manufacturer boiler terminal layout.<br />
* Some boilers require internal links to be removed when controls are fitted.</div>Morgan Allen