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Combi Boiler Fault Finding

Basic Overview

Following is the basic sequence of operation of a gas boiler.

Pump >
Pump Switch >
Fan >
Fan Switch >
Gas Valve >
Ignition >
Heat produced >

Sequence of Testing

– Power coming into boiler
– Boiler Pressure between 1 and 2. Will activate at lows from 0.5 onwards.
– Heating Controls calling for heat or hot water activating flow switch/turbine.
– Check pump circulating
– Ignition
– Ignition should stay on.

Disclaimer: Information on this website is provided for informational purpose therefore we cannot accept liability for subsequent problems. All repair tasks should be carried out by qualified trades people. We may also receive commission payments when you are taken to external websites and complete purchases from third party sellers, once you leave our site, we cannot be held liable for your purchases.