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.
- posted
16 years ago