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Limit Swith on Coleman Central Heating and Air

\015 Green Lights blinking 4 times, which is the code for the limit switch. When i turn on the power the blower fan automatically turns on. When i turn on the thermostat it clicks. But, it does not start the globe in the pilot. It's done it before in the past and they said it tripped the limit switch. Can you help?\015

Answers :

Sounds like the limit switch is not bad ...... its just doing its job. You need to determine why he furnace is overheating. Are your filters clean? Is your blower wheel clean? Is your blower motor running fast enough? It might be set on to slow of a speed. The blower motor capacitor could be bad. Are all of your air vents in the house open? Are your return air registers blocked? Is your duct work properly sized? Put a thermometer in the return air duct. Note the temp. Now stick the thermometer in the plenum. Note this temp.. Subtract the high temp from the low temp. This number should fall within the temp. rise rating found on the data plate inside the the furnace on the same sticker as th model and serial numbers. If your temp. is above the suggested temp rise. you have an air flow problem. If it is within the suggested temp rise listed then your high limit control should be replaced.
\015\012Good luck

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