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Old 03-17-2013, 12:53 PM   #15
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Thanks for getting back to us. We hope that was the true fix for your problem.

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Old 03-19-2013, 01:25 AM   #16
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Well dang, I just lost everything I'd written. Try again. We are looking to buy a Tiffin. Salesman told us Heat Pumps, when you first start them in the cold, lock up if you try to set therm at your top desired setting. Instead, he said you have to walk them up in small increments, letting them sit a few minutes at each setting before setting the next higher temp...and keep resetting in small increments up until you get it to where you want it. Otherwise, they lock up. Check with a dealer to verify because I'm only passing on what salesman mentioned (out of the blue, btw).

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Old 03-19-2013, 01:31 AM   #17
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Heat pump lockup.

I keep wiping out my post. Last try: dealer told us (out of the blue while we were shopping other day...looking to buy Tiffin mh) that Heat Pumps you can't just start up when cold...not by setting top desired temp anyway. You have to work them up in increments, resetting a bit higher each time, then letting it sit, then inching up, sit, etc., until you can get it to temp you want. THEY LOCK UP if you try to take them to the top temp all at once...out of the blue...when cold (I believe he meant: at start up anytime...but he did mention when cold). Check with service or a dealer. Good luck.
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Old 03-19-2013, 09:14 AM   #18
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Your dealer is badly in need of real world experience. You "walk" the heat pump thermostat up to keep the propane furnace from coming on. If the coach is cold set the thermostat to electric heat and set the temperature no more than 3 degrees higher than ambient. Continue to do that until you reach the level you want.

Set it higher than 3 degrees and your propane furnace will come on. The unit will revert to heat pump mode after the set temperature is reached.

One final thing - the outside temp has to be above 40 degrees for the heat pump to operate.
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Old 03-19-2013, 08:02 PM   #19
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Our T-Stats have a setting for Electric Heat and Gas Heat, electric being the heat pumps. I've been told if the temps get very cold the heat pumps will not function.

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Old 03-19-2013, 08:51 PM   #20
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Despite the promo to the contrary, we've had the heat pumps work well down to 36 degrees. Also, It's not your AC/ heat pumps that are causing the gas furnaces to come on when you call for a temp significantly higher than the room temp, its the thermostat. THese are programmed for a 5 degree split. If this condition happens for three consecutive times, the thermostat thinks the heat pumps are not functioning properly (either too low an outside temp or a malfunction) the thermostat will then lock out the heat pump for 1 hour and 45 minutes. After this time the thermostat will try the heat pump again and the three tries will happen again. This info is in the thermostat Installation, Operation and Application guide for the RVP 1 stage heat pump thermostat that Tiffin is now putting in their new coaches. these are 8530A345, 8530-338, 8530-346, 8530-348 and 8530-349 thermostats.

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