Hoping for some help. My gas furnace had been working ok, until last wknd. Last wknd I installed a new gas stove and also changed the iron gas inlet pipe to my furnace - shortened from 14" to 12". I didn't change anything else on the furnace and now, it starts, blower starts up, igniter works, the gas valve wires are reading 25volts during the ignition phase, but no gas is released and it doesn't ignite. I've rechecked the pipes, cleaned the igniter, the flame sensor, contacts for the gas valve, but nothing. I don't smell any gas being released. I listened for any clicks at the gas valve and I didn't hear anything. I checked the circuit board and all seems fine - tightened up all the screws. My gas water heater and gas stove have been working great - but not the furnace. Ideas? Could it be the gas valve switch or even the gas valve itself?

I have a 40+ year old forced air oil furnace and the belt-drive blower just started squeaking badly. It appears that the entire shaft that the blower blades spin on has slipped toward the back of the blower housing (away from the drive pulley, but the pulley is fine), allowing the blower to rub on the back of the housing. But I can't see why or how this could have happened or how to fix it. I just see that it has happened. I can push on the rear of the shaft and it will move a solid inch toward the front, and then start sliding back again once the blower is turned on. Making it more fun, there is no good way to access the blower. But if I knew what went wrong I might have a hope of fixing it.