Furnace blowing cold air only
Hi, I have a 1995 Prowler 22' and it seems like the furnace is only blowing cold air. It does state there is an AUTO Igniter but I can't see the pilot or flame or smell gas.
Forum Discussion
First understand how a RV furnace works which is very different from a residential furnace:
1. Thermostat calls for heat
2. Blower motor turns on and blows cold air out of the vents
3. Blower motor continues to run for several minutes
4. Burner ignites and gradually warms the heat exchanger
5. Air blowing out the vents gradually warms as the heat exchanger warms
6. Thermostat is satisfied and turns off the burner
7. Heat exchanger gradually cools
8. Air blowing out the vents gradually cools as the heat exchanger cools
9. Blower motor shuts off
It may take several cycles of the blower motor coming on and the burner trying to ignite until it finally ignites if the RV has been sitting or you changed a propane tank. If the burner does not ignite after a very short time, then the blower motor will turn off.
If you turn down the thermostat before the burner ignition cycle starts, the blower motor will turn off.
There are several safety devices built into the furnace that can prevent the burner from igniting. They can be doing their job correctly, or they could be faulty.
1. Thermostat calls for heat
2. Blower motor turns on and blows cold air out of the vents
3. Blower motor continues to run for several minutes
4. Burner ignites and gradually warms the heat exchanger
5. Air blowing out the vents gradually warms as the heat exchanger warms
6. Thermostat is satisfied and turns off the burner
7. Heat exchanger gradually cools
8. Air blowing out the vents gradually cools as the heat exchanger cools
9. Blower motor shuts off
It may take several cycles of the blower motor coming on and the burner trying to ignite until it finally ignites if the RV has been sitting or you changed a propane tank. If the burner does not ignite after a very short time, then the blower motor will turn off.
If you turn down the thermostat before the burner ignition cycle starts, the blower motor will turn off.
There are several safety devices built into the furnace that can prevent the burner from igniting. They can be doing their job correctly, or they could be faulty.
