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Old 04-24-2013, 09:39 AM   #11
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I've also got an email into Dometic.
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Old 04-24-2013, 09:48 AM   #12
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Thanks Mr Clemens that would be most helpful!
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Old 04-24-2013, 11:24 AM   #13
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Response from Dometic...

1) There will always be 3 clicks from the control box (or upper unit if board is pre-installed) when operating heat pump. The first click will be 5 seconds after heat pump mode is selected for FAN if in HI, MED, or LOW. Note: On older models MED fan speed was not available. So, the first click is for the fan relay. The 2nd click is to energize (or de-energize) the reversing valve relay which controls the flow of refrigerant. The 3rd click is for the compressor relay which turns the compressor on to start pumping refrigerant. If the fan is in the AUTO position - meaning the fan won't come on until the compressor comes on - then all 3 of the clicks will happen at roughly the same time (within 15 seconds). This is normal.

2) The second complaint listed below about the unit stuttering could be that they are trying to operate the heat pump out of the normal range of operation (on the high side). The heat pump works great in the range of 40-60 F outdoor temperature. In temperatures above 60F (let's say, 70 F) this the compressor could potentially overload and shut itself down. Running on HIGH fan will help avoid this condition by maximizing heat transfer across the coils. Also, make sure the indoor filter is clean and not blocking air flow.

On the low side of the temperature range the compressor will run below 40F down to 30F in defrost mode - which means 25 minutes heating and 5 minutes defrost (fan runs, no compressor). Defrost mode will be indicated on the thermostat.
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Old 04-24-2013, 09:27 PM   #14
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None of this describes what is happening. The fan tries to start then shuts down before it gets to speed. And does it two or three more times before starting. It is like holding the key on a car starter only for a second and stopping before the engine starts. None of the conditions described in the email from Dometic was true. 50 degrees, fan on auto, filter clean, etc. Finally the fan starts, then the compressor, etc.
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Old 04-24-2013, 10:42 PM   #15
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Mt Clemens


I'm in agreement with Bill. My Coach is at Tom Raper's London Ohio maybe you could ask the heat pump folks to call the service manager for me?

I leave on vacation next weekend.
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Old 04-25-2013, 08:34 AM   #16
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His parting line was, if its none of that, have the dealer take a look.
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Old 04-25-2013, 10:57 AM   #17
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Mr. Clemens,

The Dometic response that you posted is very good infromation even though it did not solve the poster's problem. I don't recall the 40-60 F range being mentioned in any of the literature that came with our new 3100, but it should be made clear to every new owner.

I experienced the the defrost mode when the forecast was for a low of 45 but it actually dropped to 35 and rained. That's a bad condition for a heat pump.

Thanks for your participation in this forum.
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Old 04-25-2013, 06:25 PM   #18
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I agree! Thank you!
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Old 04-25-2013, 08:50 PM   #19
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I had that exact problem with our 2012 3170. After the first heat pump run, the second start up would stutter three or four times. The fan would run for a few seconds and the unit would stop. Seconds later it would do it again. Each time with a clicking noise.
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Old 04-25-2013, 08:56 PM   #20
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Didn't finish. This was the first time we used it. Took it to the dealer and was told after a couple says that this was normal. Didn't believe so u called Dometic. Forgot to mention that we had the then fairly new round digital thermostat. Dometic said it was either cold and warm air going over the thermostat or a bad thermostat. For various reasons I did not want to return to the dealer, so I figured out which thermostat I needed and ordered a new one. Installed it and problem fixed.
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