Furnace problem

[FulltimeRVer]

Hi I have a 2013 vengeance 306v and the furnace only works when the battery switch is in the off position any help whould be greatly appreciated

[kenandterry]

An RV furnace needs 12VDC, along with factory ceiling fans, factory lights, water pump etc.

So…..do any of these work when your furnace does, or do you turn the battery switch to the other position?

[FulltimeRVer]

All my lights and everything work fine when I got the battery switch on the furnace doesn't work when I turn it on it clicks then about 10 seconds clicks again but works just fine when the battery switch is in the off position

[Larry-NC]

Please use your multimeter to measure the voltage directly across the two battery terminals in these two conditions:

• Battery switch on
• Battery switch off

and report both voltages.

The furnace needs at least 10 volts or so to operate. I'm guessing that you are on shore power now. With the battery disconnected, the converter (charger) provides about 13 volts. If the battery is connected, and really low, it could pull the converter output below 10 volts.

If that is the case, and the battery is revivable, just leave the switch on for a while and let the battery charge before trying the furnace again. If you need the heat now, you can delay the charging until you don't need it.

Remember, though, that a discharged battery can freeze and be destroyed. A fully-charged battery can withstand a much lower temperature before freezing.

[FulltimeRVer]

The battery should be fully charged its been plugged in to shore power for a few months now with the battery switch on I just started having my furnace problem a few days ago

[Larry-NC]

Originally Posted by FulltimeRVer

The battery should be fully charged its been plugged in to shore power for a few months now with the battery switch on I just started having my furnace problem a few days ago

What furnace do you have? Is it a Suburban?

Normal operation of a Suburban furnace is to start the fans with a 15-second purge cycle (loud blower noise) followed by a 7-second ignition cycle (fans continue to run, soft clunk from gas valve, rapid clicking of spark ignition.) If there's no ignition, the purge and ignition cycles are tried once more. Then the furnace goes into lockout and won't try any more until the thermostat switch is moved from Heat to Off and then back to Heat.

In your circumstance, you have repeatedly shown that the furnace operates with converter power, but not with converter and batteries. The only thing that's changing is the power source. Please give the requested measurements and not your guesses.

[kenandterry]

I’ll hand off to you Larry-NC

Watching from the sidelines……..

[FulltimeRVer]

Ok I will do that when I get back to the rv this weekend and thanks for the help

[FulltimeRVer]

Hi I have a 2013 forest river vengeance 306v and iam trying to troubleshoot why my furnace is not working and wondering what wires I touch together to bypass the thermostat I have 3 wires going to the thermostat red blue and white thank in advance

[Capacitor]

Can you post make and model of furnace as well as a picture of the thermostat with cover off? Off hand I would say red and white if they are in the same sheath.

[Mr. Dan]

Two like threads merged

[Mr. Dan]

OP, you have been asked multiple times: “What furnace do you have? Is it a Suburban?”. Do you know the answer?

[FulltimeRVer]

I can but it will have to Saturday morning iam on the road right now but what I do know it's a Suburban furnace