Question about Heating & Cooling
There are a couple of things this may be, so will need checking to rule them out as the cause.
There is a "hot wire" sensor in the pilot flame that allows the main gas valve to come on when it gets hot.
You will need to check the output from this when cold, and when hot. It's a safety feature to prevent gas escaping when not lit.
When cold, check there is continuity in the gas valve coils. A faulty gas valve will not open. This should only be replaced by registered trades people if it is faulty.
Check the blower motor coils in the same way for continuity. If they are defective, they will not allow power to the gas valve either - or it will cause overheating.
If everything checks out ok on the boiler side, try jumping the thermostat contacts, and see if it fires up. If it does - replace the thermostat.
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Posted on Jul 06, 2008
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Posted on Jan 02, 2017
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