Rheem ignitor?

______________________________________________________________________ Rheem Criterion furnace, 6 years or so in age. When I tried to turn the heat on the furnace blower starts, the furnace clicks to try and light but no flame. I smelled gas, reset the system, and retried, Continue reading

RTH8500D Auxilary heat options

______________________________________________________________________ This is the first winter we have been in our new house. When I installed the HVAC unit I bought the best thermostat I could find which was the RTH8500D. I want to know how to delay the auxillary Continue reading

Fan runs continually

______________________________________________________________________ I have a Rheem gas furnace with central air and the fan on the air handler runs non stop. I disconected the thermostat wires from the circuit board to eliminate a bad thermostat and the fan still runs. Do Continue reading

Make it stop!

______________________________________________________________________ I have an old Honeywell mercury switch thermostate I’ve taken apart. The blower will not stop on my gas furnace (central heat circa 195?) No heat, just air but its driving me nuts. Any ideas how to stop this? Continue reading

fixed the combustion blower problem

______________________________________________________________________ Thanks for the reply. I traced the fault down to a stuck relay on the honeywell fan timer control. I cross referenced the american zettler relay to an omron number available to me soldered it on the board in Continue reading

Wiring up a Honeywell RTH7400D Thermostat

______________________________________________________________________ I’m having a few problems here. First of all I previously wired up a different honewell Thermostat before I realized it was the incorrect one so it has been on and running my AC for awhile before I realized Continue reading

Where does my filter go?

______________________________________________________________________ Hi Everyone, I have a Lennox G8 series which is roughly 15 years old. We’ve just moved into this house and I would like to get the filter installed before I turn on the heat. The problem is, I Continue reading

Same problem- keeps trying to re-light

______________________________________________________________________ I posted the problem on Oct. 11 and got a quick response. I thought I solved the problem but it’s back. The furnace lights normal then all of a sudden the igniter starts going on, the burners shut down, Continue reading

sequence of operation?

______________________________________________________________________ I am currently working on a 25 year old Bryant furnace. The furnace is model:397HAW03608. This furnace has 2 circuit boards. One for the inducer fan and a main board for the furnace. When I tried to start the Continue reading

gas furnace won’t cycle on

______________________________________________________________________ My gas furnace is an 10 year old York Diamond 80 model number P2MP012N06401D. During the initial use this season (last week), it would only work if the fuse on the main house fuse box was turned off and Continue reading