The gas tube is clear. Will the gas company perform the gas pressure test on the GV as a courtesy? Popped the cover on the IM and didn't see any components that had taken an excess amount of heat. Couple of signal diodes, couple of small transistors, 2 small relays, one larger one, a small NAND or N...

Make sure burner tube is clear and gas is able to get through from gas valve. IF it is all clear, the HSI is glowing bright and receiving 120vac and drawing 3-6 amps and GV is getting 24-28vac at the GV terminals, it should ignite. Under those conditions, if it fails to ignite, you would need to hav...

Hey Wayne, After 24VAC at TH on the IM, Booster Motor purges, the HSI 'clicks' and energizes and glows for about 34 secs and then a 'clunk' and the Gas Valve energizes. No ignition and the HSI clicks and turns off before the 6 sec Gas Valve cycle. The voltage on the RS terminal for the FLS is at abo...

Hi Monty, Sorry for delay, been away from forum since Friday. With circuit completed and 24vac at TH terminal on IM, Booster Motor will purge the chamber for approx. 15 seconds. After 15 second purge, Ignitor will be energized with 120vac and draw 3-6 amps. Ignitor will remain energized for approx. ...

The furnace didn't come on this morning so looks like I'm back to diagnostic steps 1 & 2 above...Monty

Resistance of the HSI is 121 ohms. I read an open on the IGN terminals of the IM looking back at the module. After the continuity check and having put the HSI quick disconnects back on the IGN terminals, the furnace has been working flawlessly. It has cycled on and off 3 times with the T-stat set at...

Sorry for the delay Robert...Computer problems... After advance diagnosis: 1. The TH terminal of the Ignition Module (IM)is getting 24 VAC via Roll-Out Switch via the Limit Switch & Cetrifugal Switch from the Heating Relay. So looks like the VALVE output of the IM should be satisfied (forgot to ...

Hi, This is a MH Furnace, a newer one at that. Below are some possible faults, could be one or more than one: Ignition Module # 1474-0041 @ $169 Hot Surface Ignitor # 1474-051P @ $33 Fan&Limit Switch # 2845-3171 @ $14.25 Fan Relay # 3110-3301 @ $27.20 Heater Relay # 2940-3551 @ $30.36 To know wh...

(I do appreciate your help and can understand your reluctance to offer any more assistance, but if you're doubting my competence) What this really has to do with is the fact that I have no listing on this unit. I believe at this time the unit is not a Mobile home furnace. We do mobile home equipment...

do appreciate your help and can understand your reluctance to offer any more assistance, but if you're doubting my competence, I just retired Jan 3 from the Federal Aviation Admin after 35 yrs of radar, sonar, comm, network, & every conceivable type of electronic repair you could think of. I hol...

If that is the case you have another problem. At this time I am going to recommend you call a professional for on site service at the home. Unfortunately I can no longer be of assistance after exhausting the all the possibility's we have discussed. This unit really needs a professional who is there ...

Now when you say "Burner controled by T-stat.", are you saying as long as the t-stat is supplying 24VAC (room temp < t-stat temp), that burner will be on? Cause if that's the case, I still have a problem since the t-stat is set to 80 degrees and the room is around 60 degrees and after seve...

No duty cycle.Burner controled by T-stat. There are limit switches etc that will open the T-stat circuit if a problem happens.

hvac1000

So any time that t-stat calls for heat (supplies 24VAC via the WHT wire from t-stat,)the burner should be on during that time and not toggling on and off? Just want to make sure there is not another problem causing it to cycle on & off or is that just the duty cycle set by mfr?

Monty

So...does the furnace burner cycle on & off with the blower on when the t-stat is calling for heat

The burner will cycle on and off with the thermostat. Since you jumped the switch the blower will run all the time. This set up will work until you get a part.