Cruisair - Short cycling when heating but not when cooling. Thoughts??

Stee6043

Well-Known Member
Jun 1, 2015
6,706
West Michigan
Boat Info
1997 Sundancer 400
Engines
7.4L Gassers
Since I've been running the heat the last two weekend I've noticed that one of my Cruisair units will consistently short-cycle on heat mode. It'll kick on, heat quite nicely and then shut off after maybe a minute. Maybe two minutes. It's the same period of time each time.

Has anyone experienced such a thing? The unit in question still operates normally in cooling mode as it did all summer. I've turned the temp up several degrees to see if it would run longer and no luck, same short cycling.

Thanks in advance for any thoughts on the matter!
 
check the location of the thermistor bulb (probe)in relation to the compressor or return air flow. The thermistor may be going bad . It is possible for the thermistor to function close to normal in cool and not in heat mode. It may be as simple as the thermistor can't translate resistance to heat like it did when new. It's a cheap fix in any case.
 
check the location of the thermistor bulb (probe)in relation to the compressor or return air flow. The thermistor may be going bad . It is possible for the thermistor to function close to normal in cool and not in heat mode. It may be as simple as the thermistor can't translate resistance to heat like it did when new. It's a cheap fix in any case.

Very good. Thanks for the tip! I can check that this weekend. Now to find out what this probe should look like and it's probably location...

Thanks again.
 
They are usually attached right on the unit in front of the heat exchanger.

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If there is /are air filter(s) in the return air ducting, check that the filter(s) are clean. Dirty filters restrict air flow, causing high head pressure in heating mode. Also check that air duct / discharge defuser dampers aren't closed off, restricting the air flow, causing same problem.
 

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