Heater on battery power?

[TurnerFam]

I suppose, yes, the control board could be the issue since it may provide 12v power independently of the igniter, which might be why one works on 12v and the other will not, though the issue of everything working fine when on 120v power still confuses the situation.

[Cason61]

Originally Posted by Long & Winding road

Very odd.

Do you have a digital thermostat? (or Even the analog one). If so does it display the temp without AC or Genny power? Perhaps it not getting 12v power to activate fan?

When you move the temp up or down (while on HEAT) does it "click" (without AC or Genny power on)? If not - check wiring behind thermo.

Just an Idea.

If I think of any others I will thow them on the wall to see if they stick.

I bet its something simple but I cant think of anything else unless it need more 12v juice than your providing (I would get a cheap mutimeter if I was you- Im just learning how to use mine..... but its becoming a valulable tool for me).

Yeah, they cost maybe $12.00 and you won't need half of the functions.

[16ACE27]

Originally Posted by westlaker

That seems to fit the facts. So, are my batteries weak? New batteries?

I don't know. Did you get a multimeter and check the battery voltage? Did you check the DC voltage at the furnace?

Do you have a battery charger? If you put a battery charger on your batteries does the furnace work?

[axis earl]

We just had the circuit board replaced on ours. Propane just wouldn't light off, no matter what the power source. Now it works.