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Old 10-03-2016, 05:31 PM   #1
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Newmar Owners Club
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Posts: 56
Dometic Duo-therm Heat Pump won't make heat

I have a Dometic model 630516.321 heat pump, Prod No. 991760370. Both of my units have been working fine for the 2 years we have owned this coach. Yesterday the rear heat pump quit making heat. It does blow cold air (it is stuck in AC mode).

From what I've read in the forums most units default to heat????

I have measured the resistance on both the front (working properly) and rear heat pumps, they both read 260 ohms. I believe they should be reading 465 +/- 10%.

Does anyone know if my unit defaults to AC?

Does it make sense that the front unit will produce heat even though the reversing valve coil reads 260 ohms?

Thanks in advance for the help. I bit the bullet and ordered two new coils from PPL in Texas. I hope I didn't screw up.

"Currently a little cool in Asheville, NC!!"
Greg & Karen
05 Dutch Star 4023 - 370 ISL CM850 HPCR
Spartan Mountain Master - 2021 F150
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Old 10-05-2016, 10:27 AM   #2
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Monaco Owners Club
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Location: Columbus, MS
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Greg, do you have the 5-button Comfort Control Center thermostat that controls both units? If so, I would try resetting it.
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 10-05-2016, 05:33 PM   #3
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Thanks for the recommendation. I tried it and it didn't work.
Greg & Karen
05 Dutch Star 4023 - 370 ISL CM850 HPCR
Spartan Mountain Master - 2021 F150
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Old 10-12-2016, 10:47 AM   #4
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Dometic Model 630035.331 Sensing Valve

. . . Anyone have an idea as to where I can get a reversing / sensing valve for this? Ducting is only putting out hot air but coil is frosted & cold. . .TIA
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dometic, heat, heat pump

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