Combi Boiler Fault Finding

Basic Overview

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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