AC/Heatpump units cycle numerous times blowing ambient air.
When starting the Dometic AC/Heatpump units (independently of each other) in either AC or Heatpump mode, the units cycle through the start sequence numerous times blowing only ambient air (it seems the compressor never kicks in) before finally providing either cold air (if using AC) or hot air (if using heatpump mode). During the run cycle (when left on for an extended period of time) the units go in and out of working properly. It doesn't matter if the front unit is run isolated or the rear unit is run isolated, both units, independently of each other, react the same way. The telephone type cables have all been checked and the control panel seems to be OK. Any suggestions?
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Re: AC/Heatpump units cycle numerous times blowing...
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
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www.irv2.com > ... > RV Systems & Appliances Jan 22, 2012 - 12 posts - 4 authors
Duo Therm by Dometic 13500 BTU air conditioning with ducting, furnace. I. ... If the fan runs but no cold air and the compressor feels like it is ...
A few things can determine that , or cause it. First of all, where are you checking the ambient air temperature and what type of system do you have, is it ducted, blows out of ceiling assy? Has unit been properly cleaned lately? If ducted, have you checked for cool air leaking by to return air box?
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.
dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up
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
Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.
If unit was freezing up the air flow would normally stop, until the unit is turned off and allowed to thaw. I suspect evaporator blower may have a worn out belt, or compressor is shutting off due to control or internal overheat. What is the age of the unit?
Ice on the coil is caused by 3 things; 1, low freon charge. 2, inadequate air flow across the coil, this can be a filter or dirty coil (I think you addressed these) or the fan isn't blowing enough air over the coil. 3, the unit is running continuously. A heat pump has another cause, that is something defective in the defrost system, like the sensor, reversing valve, control board or relay. If the breaker is tripping its because the compressor is over amping. There can be an obstruction blocking the fan or something like #2. Or the compressor is going out. If the breaker doesn't trip on other settings, like cool, but trips on heat, then I would look at the airflow.