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Intertherm rooftop air conditioner problem

I am trying to figure out a problem with an older Intertherm roof top air conditioner that has a heat strip installed.The air conditioner seems to work fine with all the fan speeds but when I attempt to turn on the heat, it feels like there is some heat there but fan either only blows out very low or none. This is on a houseboat that has two of these and the other unit seems to blow fine with heat strip on. I do not know if the is a heat strip failure of some relay or control problem or what. Also if you can diagnose can you tell me where the best supplier of parts for this brand of unit. Do not have the model # [sorry] but do know the boat is a 1983 and I am quite sure it is original.

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With two units of the same make and one works right and the other does not you can use an OHM meter to check the resistance through the heaters on the good one then compare it to the readings on the one which is not performing. NOTE: with the power off of course.

Posted on May 13, 2008

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