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Dometic hb 2500 not cooling

The hb 2500 starts up, funs are working but it will not ool the air nor het if used in heatpump mode

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  • Dometic Master
  • 6,465 Answers

Make sure fans on auto

Posted on Oct 06, 2017

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3 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Sea Breeze
  • 4654 Answers

SOURCE: AC/Heatpump units cycle numerous times blowing ambient air.

If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

Posted on Feb 07, 2009

daddyo742001
  • 70 Answers

SOURCE: have one heatpump condensing unit[muh12tn] with 3

Check and see if they have solenoid valves on each and if they have tx valves or cap tubes to meter refrigerant. txv could be bad, solenoid not opening or even low on freon, Sounds like valve is not opening or dead power head on txv.

Posted on Jun 28, 2009

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1 Answer

331 630035 model


Follow the steps in suggested answer #3. Make sure the cable connections are good and the wires have continuity. When I've had this code in the past it's usually been the control board in the heat pump, on top. There is a fuse on that control board as well, make sure you check it. If everything else checks out replace the control board.

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My 19 ft airstream's Penguin duo-therm a/c unit just started blowing out HOT air!!!! Why is this occurring?


If you have a heatpump model a/c unit, and it is blowing air that is hotter than the ambient temperature inside the airstream, then it is likely that your reversing valve is stuck in the open or closed position. A heatpump is basically an air conditioner that will also run in reverse (via the reversing valve) in order to heat instead of cool. The valve can get stuck for a variety of reasons, including; faulty wiring caused by rodents chewing or vibrations, insulators (dirt) between switch surfaces, or it could be a mechanical problem within the valve its self; these valves break often.

Sep 12, 2013 | Dometic Heating & Cooling

1 Answer

I have Dometic Roof Top Heatpump Model B3200 It will not turn on when it is a cold morning. The only way to get it started is to heat up the air in the caravan using a fan heater. This somewhat stupid...


To getproper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV

Dec 30, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Heat pump heats with ac cool mode on dometic rv rooftop.


Sound like the change-over valve on the heatpump is not switching. Could be the valve is stuck, or bad. Or the thermostat is bad and will not send voltage, or is sending voltage to your change-over valve.

(Some systems energize the CO valve to cool, while others de-energize the valve).

Usually the color coding for the thermostat wires on a heatpump are orange and yellow. The yellow wire usually energizes the compressor contactor, and the orange wire energizes the changeover valve. Now depending on what your system does in terms of energizing or not energizing the CO valve to invoke heating or cooling mode is not known. You can try jumping across the thermostat to see if the CO valve is working. Or you can even try placing the stat in heating mode and see if you hear that loud "Woosh" when you switch between heating and cooling modes at the stat.

What often happens is the cylinder inside the CO valve gets stuck, especially if the system has sat off for an extended time. By workign the stat from heating to cooling (reversing the porting on the CO valve) will cause the valve to free itself up.

If you cannot hear that woosh as the changeover valve switches between heat and cooling, it is possible the CO valve is bad, or there is an issue in the electrical or control side of your system. Such as a bad base or switching circuit in your stat, or control issues other places.

Sep 03, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

2005 s type jag a/c quit blowing cold air suddenly .just blows hot at any setting or on auto


hi,is this a heatpump or a ac unit only...if a heatpump ,there is a valve that switchs from heat tocool mode...go outside with unit running..put hand on big copper line,if it is hot your in heat mode..if cold your in cool mode....possible stuck change over valve if a heatpump...hope this helps...good luck...michael doctor airr appl.repair..843-384-8474...if need more assitance..call..its free...good luck

Mar 26, 2010 | Heating & Cooling

1 Answer

Heat Pump and fan work fine, but will not blow cold air on AC setting


The reversing valve coil may be bad or no power to it during cool. Most heatpumps are set to have the coil of the reversing valve energize in the cool mode. The heating mode is the fail safe mode if the rev valve fails to energize. Check this and let me know.

Jun 18, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

AC/Heatpump units cycle numerous times blowing ambient air.


If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

Feb 07, 2009 | Dometic Rooftop RV Air Conditioner

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