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Old 07-26-2021, 07:52 AM   #1
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Join Date: Feb 2019
Location: Fredericksburg
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M.O.C. #23470
SoftStart issue

I'm having issues installing SoftStart on my 2019 330RL MHC 5er, rear AC unit. The rear AC unit on my RV is a Dometic Blizzard.

The SoftStart tech says my connections are correct, but it's not working properly. First, after several minutes running the AC compressor shuts off. Secondly, instructions say the SS green light should be glowing but I have a green AND center red light glowing ((I have meticulously checked every connection). Third, with nothing else on, current draw is 25 amps and it will not run on one 2000 watt generator (sea level altitude).

I'm waiting to hear back from the SS tech. If I can't resolve this, then I'm going to have to remove SoftStart and restore my AC wiring back to original setup. Has anyone else had this issue with a Dometic Blizzard and SS?

Something is not right. I wonder if the SS wiring diagram is correct or if the SoftStart is defective. Has anyone had this issue or anyone successfully installed SS on a Blizzard? is offline   Reply With Quote
Old 07-26-2021, 07:55 AM   #2
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Location: Milwaukie, OR
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M.O.C. #23668
No help, yet. I have ordered the MicroAir Easy Start for my Blizzard. So same AC, similar product. Hopefully it will arrive soon and I can report.

Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / Andersen Ultimate Hitch on B&W Ball
2012 RAM 3500 Big Horn Crew Cab 4x4 SRW / AMP Power Running Boards / Air Bags
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Old 07-26-2021, 08:35 AM   #3
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M.O.C. #24086
I installed a SoftStartRV on my FRONT AC unit. Took way longer than it should have. I had to drill out one screw in the cover. After that it was pretty straight forward.

One correction in the instructions for a Dometic Blizzard NXT. MFG# H541916A721J0

(Note: this is the NON heat pump unit. I don't know if there is a difference with the wiring on the rear heat pump unit).

STEP 5. The blue compressor wire does NOT go to the K2 relay. It goes to the K1 relay.

Maybe to test your softstartrv, move it to the forward AC unit and see how it runs on that one?
Daryl and Marianne,
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Old 07-26-2021, 08:38 AM   #4
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M.O.C. #2283
A 2000 watt generator only puts out 1600 running watts and that is 13.3 amps. As for the red light wait on the tech to call.
Lynwood Harrell
323 RL HC 2008 F250
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Old 07-26-2021, 10:36 AM   #5
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M.O.C. #26190
Dave, I have a 2019 3560RL with the Blizzard NXT, and I have the Micro Air Soft Starts on both A/C units. This was the wiring diagram I followed, which is on page 22 of their installation guide. Pages 22-26 is what I went by. My units also had the start up capacitors which I removed.
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2019 Keystone Montana 3560RL
Truck: 2020 Chevy Silverado 2500 HD Duramax: Firestone airbags, Curt gooseneck, Anderson hitch, TST-507, Micro-Air thermostats & easy start. USMC combat vet & retired LEO. Robert, Anika, Breanna, Dylan & our dog Layla
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Old 07-26-2021, 11:50 AM   #6
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M.O.C. #9969
If you're drawing 25 amps with nothing else on there is a serious issue.
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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Old 07-26-2021, 01:53 PM   #7
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Originally Posted by mhs4771 View Post
If you're drawing 25 amps with nothing else on there is a serious issue.

Agreed. That's 11 to 12 amps higher than a normal 15K Btu unit.

What are you using to measure the 25amp draw? Is this only at start up or is it continuous?
2019 Montana HC 310RE
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