I'm hoping either an interior or exterior extension will work. I need to get up on the roof and see how he extended it. I'm hoping he didn't cut the new roof jack, if he did I'll have to replace the whole thing.

Thanks for the excellent advice Dale! I had a different tech look at it Sat afternoon. Looks like the roof jack is once again the culprit. He bypassed the pressure switch and it runs fine. The inducer tube/motor were clear. We think there was a buildup of soot in the roof jack due to the installer n...

If I open the inspection door a bit while its igniting, it seems to burn OK. I'm wondering if the guy that installed the system screwed something up with the roof jack.

Ok, new board installed ...... same thing. Valve starts clicking, flame ignites, valve continues clicking, flame goes out after about 30sec.
Board does have 24v going to the valve now.
Transformer putting out consistent 27v.

Anything else that could cause this?

Found a new board for $80 shipped. Should be delivered today; just in time too .... its coooooollllllddddd out there.

Nordyne told me to have my service tech contact them for a replacement part. :evil: I'll just have to order a new board, they're only $104 shipped, cheaper than it would cost me to have a tech diagnose it and get the part from Nordyne. At least I'll be able to replace the 24v relays on the bad board...

Thanks Dale, sorry, should have specified I swapped the orifice as well. The valve is just clicking now due to low voltage.

OK, I see that the conversion is simply flipping the LP/NAT cap. Did some more troubleshooting. Glad I did before buying a valve. There is only 15.4v going to the valve instead of 24. The transformer is putting out a solid 27-28. Checking the plug harness coming out of the board I'm only getting 15....

Question on the LP conversion.

Other than the orifice and flipping the LP/NAT plug, is there anything else that needs changing? I've looked at some conversion kits and they seem to include other components.

Thanks!

Checked it last night. Was not set up for propane. Appears the installer also made off with the propane orifice. (Somebody is going to get a phone call and Excedrin headache #43 today) Luckily I stripped the parts I had recently replaced from the old furnace and have a #36 orifice. Valve is now havi...

Yes. I believe the roof jack was the problem with the last furnace, and with the EPA decision in litigation, and a 16yr old furnace, I had both replaced.
I need to check the valve, make sure the installer set it up for propane use.

Hi All About 3wks ago I had a new Nordyne (Maytag) M1MB090ABW installed to replace the problematic MGBB-090ABPQ-06 Nordyne unit. At first it had 1 loud click (relay/valve?) between the inducer running and the main blower coming on. Now it clicks 10-12 times. This morning it was clicking continuously...

OK. It appears the problem is in the ventilation. Was too icy/windy to let the tech on the roof to actually check the cap, but he said from the ground it appears rusty. Using his camera, there was too much soot to see if there were holes or cracks in the burner vent tube. He said the flame appears t...

I checked the voltage to the valve; 27.xx vAC. I pulled the inducer motor, the fan was pretty clean, no obstructions in the tube.
Have an appt scheduled for Thur afternoon to have a tech come look at it.

Thanks for the help Dale! I'll check on these this weekend.