Furnace cold air

[tattoo305]

I have a 2016 Gulf Stream Track n Trail 24. I bought it off a friend when it was a year old. I was like new he only used it three times. Lately been having problems with furnace. When you turn it on furnace blows hot air. Once it cycles it won’t blow hot air. Only cold air. Unless I turn it off at thermostat then turn back on. I replaced thermostat and still does it. Any ideas thanks.

[RayChez1]

Tatoo305, need a little more information as to what furnace do you have on your RV, is it a Suburban, Dometic Atwood? That way it will give somebody with knowledge on the problem and might be able to help you.
Good luck!

[THenne1713]

I have a 2016 Gulf Stream Track n Trail 24. I bought it off a friend when it was a year old. I was like new he only used it three times. Lately been having problems with furnace. When you turn it on furnace blows hot air. Once it cycles it won’t blow hot air. Only cold air. Unless I turn it off at thermostat then turn back on. I replaced thermostat and still does it. Any ideas thanks.

The SAFETY SAIL SWITCH senses airflow, (or lack of) and shuts off gas to prevent overheat. IF BATTERY CHARGE Low/ defective, Fan runs SLOW, SAIL shuts off gas to prevent OVERHEAT; since you get heat, 1) suspect problem with BATTERY/ CHARGE/ LOW VOLTAGE? 2) ALSO Make sure TANK VALVE FULLY OPEN, if not, flame maybe failing after GAS PRESSURE falls off?

[Colorado350]

The SAFETY SAIL SWITCH senses airflow, (or lack of) and shuts off gas to prevent overheat. IF BATTERY CHARGE Low/ defective, Fan runs SLOW, SAIL shuts off gas to prevent OVERHEAT; since you get heat, 1) suspect problem with BATTERY/ CHARGE/ LOW VOLTAGE? 2) ALSO Make sure TANK VALVE FULLY OPEN, if not, flame maybe failing after GAS PRESSURE falls off?

In addition to this, shut the propane tank OFF, run furnace then turn propane tank valve on SLOWLY the in tank safety valve may not be allowing 100% flow.