https://jme-training-academy.com/index.php?action=history&feed=atom&title=Heating_System_No_Hot_Water_Fault_GuideHeating System No Hot Water Fault Guide - Revision history2026-08-02T03:22:09ZRevision history for this page on the wikiMediaWiki 1.45.3https://jme-training-academy.com/index.php?title=Heating_System_No_Hot_Water_Fault_Guide&diff=34&oldid=prevMorgan Allen: Created page with "= Heating System No Hot Water Fault Guide = == Purpose == To identify why domestic hot water is not being produced in a heating system. --- == 1. System Type Confirmation == * Combi boiler (no cylinder) * System boiler (with cylinder) * Heat-only boiler --- == 2. Combi Boiler Checks == * Check flow rate demand (tap fully open) * Check for ignition attempt * Check for boiler error codes * Check inlet pressure and filters (if applicable) --- == 3. Cylinder System Ch..."2026-06-10T14:38:53Z<p>Created page with "= Heating System No Hot Water Fault Guide = == Purpose == To identify why domestic hot water is not being produced in a heating system. --- == 1. System Type Confirmation == * Combi boiler (no cylinder) * System boiler (with cylinder) * Heat-only boiler --- == 2. Combi Boiler Checks == * Check flow rate demand (tap fully open) * Check for ignition attempt * Check for boiler error codes * Check inlet pressure and filters (if applicable) --- == 3. Cylinder System Ch..."</p>
<p><b>New page</b></p><div>= Heating System No Hot Water Fault Guide =<br />
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== Purpose ==<br />
To identify why domestic hot water is not being produced in a heating system.<br />
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== 1. System Type Confirmation ==<br />
* Combi boiler (no cylinder)<br />
* System boiler (with cylinder)<br />
* Heat-only boiler<br />
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== 2. Combi Boiler Checks ==<br />
* Check flow rate demand (tap fully open)<br />
* Check for ignition attempt<br />
* Check for boiler error codes<br />
* Check inlet pressure and filters (if applicable)<br />
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== 3. Cylinder System Checks ==<br />
* Check programmer hot water ON setting<br />
* Check cylinder thermostat setting<br />
* Check motorised valve operation (hot water zone)<br />
* Confirm end switch signal to boiler<br />
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== 4. Electrical Control Checks ==<br />
* Hot water channel output from programmer<br />
* Cylinder thermostat switching correctly<br />
* Valve actuator receiving supply<br />
* End switch completing circuit to boiler<br />
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== 5. Common Faults ==<br />
* Failed cylinder thermostat<br />
* Stuck hot water zone valve<br />
* Broken actuator motor<br />
* Incorrect programmer settings<br />
* Wiring fault in junction box<br />
* Boiler not receiving demand signal<br />
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== 6. Notes ==<br />
Hot water faults are usually control-side issues before being boiler faults. Always confirm demand signal first.</div>Morgan Allen