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My boiler comes on then cuts off after a few seconds. The fault diagnosis pointed to the thermostat, which I replaced. The problem remained. I discovered that when I remove the thermostat phial from its pocket, the boiler works, but once I replace the phial it doesn't. Can you help?

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Not sure what a phial is but sounds like the wiring for the thermostat may be wrong. Can you jump the red and white wires together under the thermostat housing and see if the boiler starts? If it does, you have a bad thermostat or wired improperly.

Posted on Dec 05, 2008

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