Furnace on 72 Tradewind pilot lights but no heat

[RichHog]

So it could today and decided to try to fire the furnace up on my 72 Tradewind single. Followed the procedure in the manual (yes I have one!). Pilot light lit and burned properly but after turning on the thermostat switch to on and over to high setting nothing happened. No fan came on, furnace didn't light etc. What would be next to trouble shoot? Seems to be electrical in nature? Fuses? Thermocouple?
Thaks

[RichHog]

Checked and it's a Suburban Model NT224 if anybody knows why fan doesn't blow, furnace doeen't light but pilot burns well.

[overlander63]

Blown fuse, bad fan motor, bad connection (power or ground).
The fan running operates the sail switch, that turns on the main burner in the furnace.

[Lumatic]

That furnace has a long expired recall (at least the 22A does). The crossover tube between blower and combustion chamber disintegrates and leaks CO into the trailer. If that's not enough, parts are next to impossible to find and most techs won't work on them because of the liability. Most owners dump them and replace with a newer furnace. There's lot of threads on this if you search.

[Smokin Camel]

Originally Posted by RichHog

Checked and it's a Suburban Model NT224 if anybody knows why fan doesn't blow, furnace doeen't light but pilot burns well.

If that is the original it may have a recall. Regardless if it is an old RV furnace with a lot of years of service either get the heat exchanger checked or change out the furnace.

[seeflash]

I'm having trouble with my furnace again, 74' Tradewind. Pilot lights & works fine initially but sometimes the burner lights...sometimes not when T-stat calls for heat. Appears sometimes something shuts off gas to pilot. When the furnace shuts off after initial heat, pilot is still on but when refired pilot goes out and no burner flame. I can light the burner by pushing the piezo while fan is running and then I get heat. Anyone have an idea??

Thanks
Chris

[RichHog]

Anybody can shoot us a copy of the service manual on this unit? Mine doesn't even turn on blower. Can't track down electrical to fuse box or thermostat as wires goes out the side/back of unit. Pilot does light. Yes I do know there was a recall etc on the unit but want to get a big picture before going through the replacing options.

[azflycaster]

The two blue wires go to the thermostat. You should have +12 volts on one or both (depends on the temperature setting). I had a similar problem and it was a connector for the wire going to the thermostat. The wires were located in the closet in the bath area. Here is a diagram of the electrical.

[RichHog]

There are two thermostats in my 72 Tradewind. Seems that in an earlier post that one is supposed to control AC(front I believe) and one (-the thermostat in bedroom) controls the heater any truth in this? Wondering if it could be a control wire issue. Also do you know which fuse in the univolt would possibly power the circuit?

Thanks

[azflycaster]

My thermostats are the way you described them. My heater is on circuit number 3 along with the exhaust fan over the stove and some other items. Your TW layout is very similar to mine and might be the same as my 75.

[RichHog]

Will run down the wires and check the DC on the Thermostat in the back. Don't know how the front control works with the roof AC. Seems like you would have to turn the AC on and the thermostat would trigger it on off from there.

My vent works over the stove so perhaps the problem isn't with a fuse panel.