Last night we were using the electric furnace in our Redwood 5th wheel. Somehow during the night it switched over to propane furnace. Then the carbon monoxide detector went off. We aired out the trailor and turned off the furnace and then reset the thermostat to electric again. The electric furnace came back on. Any ideas as to what happened?
I'm not familiar with your particular unit, so I can only "guess" at the problem.
As far as it switching over to LP, is it possible it got cool enough that the electric wasn't able to supply enough heat and they might have an automatic switch over designed into the system?
Did you have any windows or vents open when the furnace was running? Especially on the side where the furnace exhausts? It's possible it was sucking the exhaust fumes back in that way. If you can't find where the fumes on getting in from, my suggestion would be to take it into the dealer and have it thoroughly checked out.
Another thought---is your unit brand new? Have you ever run the furnace before? If the answer is yes to both, maybe the alarm was set off because the furnace was burning off some of the oils on it and newness of the whole system/unit.
Thanks for the reply. The unit is just over 1 year old. I cannot recall having run the propane furnace before, if we have it has been for very short periods. Will keep an eye on it and if it happens again we will have it checked out.
Heather - By electric furnace I assume you are using the heat pump, which is usually installed on one of the A/C units, but depending on options could be on both A/C's. If only 1 HVAC multi-function controller has the electric heat option you have only 1 heat pump.
When using the heat pump the system is set up that the propane furnace will automatically kick in if the heat pump cannot supply sufficient heat to maintain the requested temperature, or the difference between requested temperature and ambient temperature is above a set level. During the PDI I seem to recall our coach is about 10 degrees. Therefore, if we select a temperature more than 10 degrees above the ambient temperature the heat pump starts, but the furnace kicks in fairly quickly.
To save the furnace from kicking in lower the temperature setting and increase it as the coach heats up. If you have the fireplace this kicks out considerable heat and also saves using propane when it is rather chilly.