I would have thought if the continuity checks out on the gas valve, the engineer then tested the pcb? Includes parts and labour to repair your boiler or system in the event of a breakdown fixed rate of £ includes one repair to fix a single fault to you gas boiler. Did you know that improper sizing of your boiler can make your unit run less efficiently and wear out prematurely? You can avoid this unnecessary expense by following our advice on how to. Join.