Old forced hot air natural gas furnace problems.

Jeff Lawrence_24

Probably a safety tripped.

If it is, it tripped for a reason. You need to find out why.

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Bill_64

Old furnace has attempted to die.

My furnace is not firing up. The pilot light stays on. I have bypass the thermostate and the furnace do not light up. I am able to turn on the fan manually. There appears to be electric getting to all parts. The one thing that I keep coming up to is a valve type device that has the main and pilot gas coming though it, it is also the part that has a knob that allows me to turn the pilot on and off. This is a robertshaw part that I am told that the replacement part is 700-406 Is there any way to check the old one before I replace it.

Timco

Check your transformer.

T

jeff_51

baso switch or saftey gas valve?

If it is a baso switch, there is a push button reset. If it is a saftey gas valve, it is prolly shot. Disconnect the t-stat at the t&t at the gasvalve and jumper out T&T. If it fires, it is not the gas valve, if it does not fire, the gas valve is bad. It also maybe labled T%TV. In anycase, it is where the t-stat wire connects onto the gas valve. Remember to disconnect the t-stat wires, or it will blow the heat anticipator on the stat and ruin it

Bill_64

furnace not firing

I did check the transformer and it is okay . In 1973 LILCO had replaced the gas valve. I did jump the stat and nothing.