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Old 11-26-2010, 12:55 AM   #1
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Unhappy Heat Pump Quit Tonight

HELP!! I've got a 99 Allegro Bus with 2 rooftop Duo-Therm 59146 Heat Pumps. We're on our first cold weather trip since purchasing rig 17 months ago. Having problems with both units.
  1. Rear unit (which we've been using this trip after front unit failed) quit this evening. With thermostat in "Heat Pump" position, and thermostat turned up, fan starts and after about 10-15 seconds I hear the heat pump (compressor?) try to engage - this lasts a few seconds and quits leaving the fan blowing cold air. Is this anything I can fix our do I need to have unit serviced.
  2. Front unit heat pump (compressor?) keeps trying to cycle on even with thermostat turned to off position - is this something bad on the relay control board?
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Old 11-26-2010, 02:56 AM   #2
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Hello and . We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
I am not sure of your skill level, understanding of how the system works or where you may be located. I would suggest you find out the exact problem before condemning the unit for a new one. It sounds like the front unit may have a start capacitor and/or a bad PTCR that could easily be replaced. If you are comfortable with electricity and want to inspect this; it is in the upper unit on the roof in the box under the shroud. Many times you can see a blown component. Parts can be available at RV shops or even a HVAC parts house. A Supco super boost starting capacitor/relay will also do the job.
Are you aware, that a heat pump is first of all only effective down to about 42 =- degrees, depending on RH? Once the outside coil freezes up and the sensor shuts down the compressor and the unit should default to the axillary heating (furnace(s) or hydronic). If you can let us know where you are or will be in the next few days, maybe someone can point you to a good repair shop that can save the day.
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Old 11-26-2010, 05:39 AM   #3
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Welcome coyoterich to irv2.
Go to my Quick Tips link there are two links on DUO-Therm's Controls that will give to information you may need.
Scroll down about half the page.
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Old 11-26-2010, 12:05 PM   #4
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Hi coyoterich,
Welcome to iRV2. Suggestions can go in many different directions, depending on some additional information. It is unusual for both units to not work at the same time. External environmental conditions can affect the units operation when they are set to heat pump. Can you tell us:

1. What is the outside temperature?
2. With the rear unit off and the front unit set at heat pump, what are the order of events? An example is:
2a. fan starts
2b. compressor starts
2c. compressor stays on and fan turns off

A scenario like mentioned above would help us help you. It may be best to resolve one unit at a time since the symptoms are different.
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Old 11-26-2010, 06:50 PM   #5
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He is completely frozen or forgot where he posted.
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