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Energy bills have been increasing. There are still ways to reduce this.

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.

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