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Older model intertherm split unit. Compressor runs, but blower will not come on auto. I have to press the switch inside the unit.

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  • gussie doucet Oct 03, 2009

    Thank you I will print this solution. My problem is at my fishing camp 112 miles away. When I go back I will give what you suggest a try. Thanks, Olan

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The same circuit from the thermostat to the indoor unit and the fan relays, etc. in the indoor unit is used to operate the indoor fan in both ON and AUTO mode. The exception is an internal connection in the thermostat/subbase itself from cool to fan which comes into play when auto fan is used. [the subbase is the part that is mounted on the wall and contains the switches] Try taking the ring off the thermostat and look for 3 itty ***** screws that hold the thermostat to the subbase. Make sure they are tight. Next, put the thermostat in cool/auto and see if you have 24 volts from G terminal to C terminal in the indoor unit. The terminals will be where the cable comes into the indoor unit from the thermostat. also likely the problem is in the fan switch sensor internally. check,keep us updated.please do rate and accept the solution.thanks

Posted on Oct 03, 2009

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