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01-03-2020, 09:05 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3901
State: Florida
Posts: 103
THOR #6952
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Air/Heat Pump Compressor not turning on
We have a 2019 Thor Aria 3901 and recently pulled into a camp site and the rear air/heat pump compressor will not engage. The fan works but no heat or cooling. I have verified we have 50 amp power. Has anyone else experienced this and if so, is there steps we should try? We called Thor and CW and have an appointment if no other options are available.
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01-03-2020, 10:37 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3401
State: Arkansas
Posts: 114
THOR #12542
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Does your Firefly show "load shed"? Mine did and it was supposedly a problem with the current sensor in the PMM. The FireFly sheds the load if it thinks that the compressor is pulling too much current.
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01-03-2020, 11:57 PM
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#3
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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What is your thermostat set at?
(Sorry to ask the obvious question...)
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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01-04-2020, 04:54 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3901
State: Florida
Posts: 103
THOR #6952
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I am not seeing "SHED" the fan works as normal just the compressor does not engage. I have moved the thermostat from 60 to 75 with no impact.
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01-04-2020, 06:28 PM
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#5
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,328
THOR #6903
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Quote:
Originally Posted by Bob Denman
What is your thermostat set at?
(Sorry to ask the obvious question...)
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Certainly the best place to start verifying
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01-04-2020, 07:43 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3401
State: Arkansas
Posts: 114
THOR #12542
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Quote:
Originally Posted by greenfield3
I am not seeing "SHED" the fan works as normal just the compressor does not engage. I have moved the thermostat from 60 to 75 with no impact.
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Thinking back, I think that mine didn't actually start with the "load shed" message, but that's what it was doing by the time I got it in for service. I think that it started out like yours. Everything appeared to be normal, but the compressor wouldn't run.
Besides the current sensor, I think that the tech also found a bad driver board on the Firefly G6A panel.
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01-06-2020, 04:02 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3901
State: Florida
Posts: 103
THOR #6952
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Thanks all!
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01-11-2020, 07:12 PM
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#8
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Member
Brand: Still Looking
State: Arkansas
Posts: 31
THOR #7075
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Have you tried with the generator running? That will help isolate if you have shore power issues.
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01-11-2020, 07:16 PM
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#9
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Member
Brand: Still Looking
State: Arkansas
Posts: 31
THOR #7075
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Be sure to disconnect shore power while testing the generator as your power source.
As you should know, you can manipulate the FireFly System. Sometimes when I know I have 50 amp Service, FireFly will show 30amp on the panel. Make sure you adjust accordingly.
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01-11-2020, 07:23 PM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: Aria 3601
State: Ohio
Posts: 9
THOR #9813
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Same thing happened to me. Warranty service found that the relay was stuck. He tapped on the relay and ac started working. He replaced the relay and
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01-11-2020, 07:46 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: Aria 3401
State: Arkansas
Posts: 114
THOR #12542
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Quote:
Originally Posted by Berlin Kid
Same thing happened to me. Warranty service found that the relay was stuck. He tapped on the relay and ac started working. He replaced the relay and
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Do you know where the relay was (G6A, PMM, somewhere else)?
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01-11-2020, 08:42 PM
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#12
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Junior Member
Brand: Thor Motor Coach
Model: Aria 3601
State: Ohio
Posts: 9
THOR #9813
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It was on the roof inside the ac shroud. It is the only relay there.
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01-11-2020, 09:31 PM
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#13
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by Mulva
Have you tried with the generator running? That will help isolate if you have shore power issues.
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the fan is running. He has power to the roof.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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01-11-2020, 09:50 PM
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#14
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Junior Member
Brand: Thor Motor Coach
Model: Four Winds 31W
State: Florida
Posts: 2
THOR #17705
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I had similar concern with heat turning on in my 2020 Thor Four Winds C coach.
I turned on the propane tank and opened the valve and then turned the thermostat panel to heat with the fan on auto. It worked fine. I also noticed the heat continued to pour out of the floor vents even during the times the heat pump was only in the fan mode.
Give this a try and see what happens. Good luck!
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01-11-2020, 10:07 PM
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#15
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by terry.bird4@verizon.net
I had similar concern with heat turning on in my 2020 Thor Four Winds C coach.
I turned on the propane tank and opened the valve and then turned the thermostat panel to heat with the fan on auto. It worked fine. I also noticed the heat continued to pour out of the floor vents even during the times the heat pump was only in the fan mode.
Give this a try and see what happens. Good luck!
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Terry, you should change your user name. Email will get you junk mail. And lots of it.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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01-11-2020, 10:14 PM
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#16
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by jtyphoid
Does your Firefly show "load shed"? Mine did and it was supposedly a problem with the current sensor in the PMM. The FireFly sheds the load if it thinks that the compressor is pulling too much current.
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Fire fly will shed any designated load in order to keep the total RV load under 50 amps. It scenes the entire load going thru the main breaker not just the compressor. It cannot single out the fan and the compressor. It sheds the whole AC system or which ever other equipment it is set for.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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01-11-2020, 10:18 PM
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#17
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Junior Member
Brand: Thor Motor Coach
Model: Four Winds 31W
State: Florida
Posts: 2
THOR #17705
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I have been thinking of changing my email address. I don't want my name showing any more. Verizon set it up this way years ago and I just went along with it. Thanks for your suggestion.
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01-11-2020, 10:24 PM
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#18
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by terry.bird4@verizon.net
I have been thinking of changing my email address. I don't want my name showing any more. Verizon set it up this way years ago and I just went along with it. Thanks for your suggestion.
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Don't have to change your email address. (But it would be a smart idea) just take it off this forum. Put a fictitious screen name in it's place. If you look at the forum 99% are fake names. Cavie is 1/2 of a last name.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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01-11-2020, 11:23 PM
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#19
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by Mulva
Be sure to disconnect shore power while testing the generator as your power source.
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Why? He has an Automatic Transfer Switch that will automatically switch to generator power (after the timed warm-up period) even if he is plugged into SP. Unless you think it will affect his troubleshooting procedure in some way?
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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01-11-2020, 11:29 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany
State: Texas
Posts: 484
THOR #1808
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my rear bedroom hp did this a in November
the end result was the heat pump switching valve , was stuck in the cold mode, had power and everything.
bottom line was replace the unit
because unsoldering in and resoldering a new switch valve was going to cost more than a new unit
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retired Navy driving the short bus 2008 Tuscany 4056
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