RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×


Reply
 
Thread Tools Display Modes
Old 12-04-2020, 12:16 AM   #1
Junior Member
 
Join Date: Dec 2020
Posts: 2
Dometic AC/HEAT pump not working

Hi All,

We just received our 2021 Georgetown GT7 from forest river and on our first voyage we were trying to test things out, the AC/Heat Pump doesnít seem to power on. If I put it in Fan mode I can get the fan to turn on and then it shuts off. Any ideas what to check? Seems odd both are doing the same thing and both are the same units I believe. This is controlled through a touch screen precision circuits touch panel. Checked the breaker and flipped it off and back on, but that didnít help.

Thank you in advance!
Jenny cantrell is offline   Reply With Quote
Old 12-04-2020, 12:28 AM   #2
Just as confused as you
 
Scrapper's Avatar
 
Join Date: Aug 2013
Location: south central Wisconsin
Posts: 4,698
Welcome to the forum from Wisconsin.
How cold is it where you are? Heat pumps do not work below 40 - 45 degrees.
__________________
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989
Car Shredder Op/Tech, Scrap Metal Recycling - retired
I deserve hazard pay when camping with my relatives.
Scrapper is offline   Reply With Quote
Old 12-04-2020, 12:33 AM   #3
Junior Member
 
Join Date: Dec 2020
Posts: 2
Thanks for the reply, we did try just the fan and it runs for a few seconds and it kicks off. Then we tried the AC to see if we could get that to kick on, that also didn’t work, along with the heat pump we tried and it didn’t even kick on, does temperature impact the ability for the unit to even kick on at all? I just assumed it would run but wouldn’t be efficient due to the 32 degree temp. I also would think if I set just the fan to high it would work? Thanks again for any help here.
Jenny cantrell is offline   Reply With Quote
Old 12-04-2020, 10:40 AM   #4
Just as confused as you
 
Scrapper's Avatar
 
Join Date: Aug 2013
Location: south central Wisconsin
Posts: 4,698
I believe the heat pump samples the outside air for temperature, how I'm not sure. Temperature does impact the units ability to run. The operation depends on the principal of how heat changes liquids to gas then cooling changes that gas back to a liquid. There needs to be enough heat in the outside air to convert the liquid to gas and the inside air needs to be cool enough to convert it back to liquid. If the unit was allowed to continue to operate with cold outdoor temperatures it will freeze up causing damage to the compressor.

When the unit is used to cool the inside of your rv the process is reversed. The direction of the flow from liquid to gas then back to liquid is accomplished by valves in the unit.

If your interested more info on how it works can be found in the following links.

https://www.newair.com/blogs/learn/c...an-be-a-heater
https://www.carrier.com/residential/...eat-pump-work/
__________________
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989
Car Shredder Op/Tech, Scrap Metal Recycling - retired
I deserve hazard pay when camping with my relatives.
Scrapper is offline   Reply With Quote
Old 12-04-2020, 01:43 PM   #5
Member
 
Join Date: Feb 2020
Location: Ohio
Posts: 72
Quote:
Originally Posted by Jenny cantrell View Post
Thanks for the reply, we did try just the fan and it runs for a few seconds and it kicks off. Then we tried the AC to see if we could get that to kick on, that also didn’t work, along with the heat pump we tried and it didn’t even kick on, does temperature impact the ability for the unit to even kick on at all? I just assumed it would run but wouldn’t be efficient due to the 32 degree temp. I also would think if I set just the fan to high it would work? Thanks again for any help here.
Welcome to the forum. We have a 2020 Berkshire with the same Precision Plex system. If the oustide temp drops below around 40 degrees (haven't been able to determine exactly what the cut off is), any A/C units with heat pumps installed will not run in any mode, including just fan. You should see "Heat Pump Lockout", or something similiar to that, on the LCD panel when the lockout is active. I confirmed this with the Precision Plex folks when our bedroom unit started shutting off in the middle of the night (we usually leave the fan on for white noise).

The Berky has an external temp sensor that trips the lock out for the heat pumps. If your unit doesn't have the external temp sensor, the A/C units will activate momentarily to pull air across the internal temp sensor and determine if the temp is too low to operate - that's likely why yours run for a few seconds and then shuts down.

While I understand the reason for locking out the compressors below a certain temp, the fan lockout is annoying. I prefer to have the air circulation and white noise at night.
__________________
Ty & Deb Montag
2020 Berkshire XLT 45A
2014 Honda CR-V toad
anaviator is offline   Reply With Quote
Reply

Tags
dometic, pump

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 08:21 AM.