Furnace fan problem

[herburban1]

I have cabin fever and went out and plugged in the camper and the furnace fan wont shut off.. I replaced the thermostat with a Honeywell which I was going to do anyway because the old one didn't have tempurature settings.. So it's an 05 Jayflight 29 BHS. I don't have a manual we bought it last year..I pulled the fuse and it shut off then came right back on. I turned on the gas and got heat so it's not a gas problem...Scratching my head here. Anyone?

[herburban1]

battery is still connected, we never got around to taking it in for the winter.. That will be the next purchase most likely.. The furnace is behind a piece of paneling under my sink so it should be fun to find..

[Old-Biscuit]

Typically 1 of 3 things will cause furance fan to run continuously

1) Faulty Thermostat
2) Shorted T-stat wire(s)
3) Faulty timed delay relay

The timed delay relay is what triggers blower motor to start/stop
It can be a separate component (small box with 4 wires. DC power from FUSE to relay then to motor AND wire from t-stat to relay then to ground)

OR it can be part of the circuit board

Yours being a 2005 model......probably on circuit board which would mean a new board


And if it came on when you plugged into AC power it was getting DC power vai converter------so battery is dead (Or hopefully disconnected)