homelesshartshorns Posted August 21, 2018 Report Share Posted August 21, 2018 I have a two year old basement air unit that use to have elect heat pumps that would come on if I wanted heat and if it was too cold for the heat pump the gas would come on. Sometimes the heat pump would come on for awhile and then the gas would come on if the heat pump was not getting us warmed up fast enough. Sometimes if weather was in the 40s only gas would come on. But this year when trying to get the heat pump to come on, temps in the 60's, only the gas would come on. What should I look at to see why my heat pump is not working??? __________________ Still seeing Places we have never seen before and others that we thought we would never see again! . homelesshartshorns | Trying to spend the last Dollar on the Last Day! (wordpress.com) George Hartshorn | Facebook Link to comment Share on other sites More sharing options...
bobsallyh Posted August 22, 2018 Report Share Posted August 22, 2018 homelesshartshorns, I probably have the same unit as you folks. Operates as you described except, if we move the temp setting more than 3-4 degrees at a time it defers to gas until reaching set temp, then on the next cycle it will go electric. In other words if the temp in rig is 60 and we set the thermostat to 72 in one shot, the gas will come on until it reaches 72. Then to maintain the 72 it will go to electric. Our heat pump will usually work between 39-42 depending on the amount of humidity in the air. If I can help anymore just PM me. Link to comment Share on other sites More sharing options...
lenp Posted August 22, 2018 Report Share Posted August 22, 2018 I think I have the same unit (Colman Mach) as you. Mine operates similar to bobsallyh's unit with following exception... When the set point is more than three (3) degrees higher than room (ambient) temperature BOTH the heat pump and the gas furnace will come on. I like to use the heat pump only as much as possible so I added a switch in the line from the thermostat to the gas furnace that must be closed (ON) for the gas to work. With this added switch I can force the heat pump only mode. Mine does a good job of heating down to around the 38-40 range also - takes a little longer but still works. I am not sure at what temperature it stops trying to produce heat but I have had it freeze up in really humid climate in the low 40s. Lenp USN Retired 2002 Winnebago Ultimate Freedom 2012 F150 4x4 2018 Lincoln MKX 2019 HD Ultra Limited Link to comment Share on other sites More sharing options...
Ray,IN Posted August 23, 2018 Report Share Posted August 23, 2018 I suspect there may be a corroded connection on the back of the thermostat or elsewhere in the low voltage system. Low voltage is very susceptible to losing contact from corrosion, polishing the contact area with a pencil eraser usually corrects the issue. Here are my bookmarks concerning my basement air conditioner, some may be duplicates, Winnebago basement heat pump AC under the coach,removal Start Device Package for Coleman Air Conditioners 8333A9021 Automotive Basement AC Removal & Outdoor Blower Replacement Procedure - iRV2 Foru (...) Welcome to S2 Distribution, Inc. dba PTAC SOLUTIONS - The Web's Largest and Most Experienced HVAC Parts and PTAC Specialists 2 Two TON Plus Basement Air Conditioner W/HP 24,000 BTU 46515-811 Airxcel | RV Products | Specialty Air Conditioners Replacing the Coleman Mach thermostat with an Ecobee Coleman 46515-811 69859 Two Ton Plus Basement Central Air Conditioner 24000 BTU Airxcel | RV Products | Service Coleman Mach - ACs, Heat Pumps & Thermostats for RVs | AIrxcel Amazon.com: Coleman 46515811 2 Ton A/C Basement: Automotive Winnebago repairs + heat pump 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Dale P Posted September 7, 2018 Report Share Posted September 7, 2018 First he need to report back on the temperature setting. Greater then 4 degrees, gas will come on. If less the 4, should work ok. If not, then start looking at the thermostat . Susan & Dale DaGirls Rv 2008 Alfa Gold SoLong ISL 425 Cummins 2015 Ford F-150 XLT Tow / Roadmaster Setup 1600W@45Vdc Magnum Inv/Chg&Solar880AmpHrDaGirlsRv Blog Link to comment Share on other sites More sharing options...
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