Heat pump question

Is this your only rooftop unit? I have 2 and the gas is controlled by the front unit only. The noise may be ice coming off the exterior fins.

I have two units but only the front unit has the heat pump. Sorry should have explained that in original post.

Don't take the switchover temp too literal. It all depends on the outside ACTUAL temp below the shroud of the Heat Pump. On Tiffin's, the clicking noise could be just as simple as the foil tape in the ductwork is peeling up on an edge. That will make a clicking sound. Now, are you stating you have the HP ON and heating, and when you notice the outside is about 40, the HP shuts OFF and then makes the clicking sound and the Floor furnace does NOT come on? Remember, the furnace will only come ON if the inside temp calls for heat. Another clicking noise may be the defrost cycle and you hear the ice dropping off the condensor onto the HP mount pan. Another cause may be a defective reversing solenoid. Some HP units will still function all the way down to outside 32 to 34 degrees. Because the HP shroud insulates partially the outside ambient temp. You can force the furnace to come ON in HP mode. This will cause the HP to shut down and the furnace mode activate just like in outside 35 degree ambient. Lets say the interior temp is 60 degrees. Set the HP at 64 degrees. Once the HP comes on, after a few minutes, manually raise the tstat temp display to 75 degrees. That will trigger an automatic shut down of the HP and start the furnace. See if you have the same sounds or if the system functions normally. Doug

Thanks Doug, The HP system is on and functioning properly but once the outside temp goes below 40 (according to a temperature gauge I have set up outside the coach) the unit will run continuously doesn't get the room warm enough to reach the set temperature to shut down the HP. Then after maybe an hour or so of continuous running will eventually start making the noise.

dsisemore1 wrote:
Thanks Doug, The HP system is on and functioning properly but once the outside temp goes below 40 (according to a temperature gauge I have set up outside the coach) the unit will run continuously doesn't get the room warm enough to reach the set temperature to shut down the HP. Then after maybe an hour or so of continuous running will eventually start making the noise.

I would suspect the Outside ambient temp sensor is bad. Doug