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Posted by Auto Tech on December 24, 2007, 12:14 pm
I have a intertherm gas fired hot air heating A/C system and yesterday
the system quit responding to the thermostat no fan no a/c no heat. I
checked the pilot light to see if the pilot light was on and it was
and if I hit the air circulation fan switch on the control box on the
inside of furnace the fan works. I pulled the thermostat cover and
moved the heat setting up to niney and looked for a spark in the
mercury switch inside and there was none I repeated lowering the
setting to cold and moved it uop again and no sark in the mecury
switch. I have worked on oil fired heating in past and you always see
a spark in the mercury switch but not this gas fired unit unit soi I
opened the control box looking for a possible wire off of terminal and
evcerything seemed where it belonged I saw two what appeared to be
relays in the box but know nothing about this system so I could use
some info from someone who may know what to look for next.
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