[kevinpan]

Hi there,

My 15 years old Nordyne Furnace ran well 3, 4 weeks ago – suddenly the Blower blew cool air while the Thermostat Control Switch was ON position (I found out that it was the A/C started blowing cool air, I guessed). After that, there were Malfunctions:

1. I turned Control Switch and Thermostat Disc to higher position, A/C ran right away (maybe Blower blew cool air from the Duct), after 2 minutes dann blew warm air. (Normally, the Sparkler and Burner work for 2 minutes then Blower blew warm air very slightly, not the loudly A/C fan).

2. The Sparkler (it is the Pilot but lights from the Electronic Control Board, I think) and the Burner worked unstabled: Sometimes they started to burn if I had luck. When the Furnace ran for about 1 hour than it started to blew cool air (Burner is off) and the Pilot is not able to re-light.

Can any HVAC expert help me to identify the Malfunctions and where can I order the parts.

Someone told me it was the Thermocouple (?)
And some told me it was the Electronic Control Board and the Gas Control Valve.
Some tells me the Thermostat and/or Glow bar cause the problems.

How can I test them before I buy parts because the old parts are very hard to find.

Thanks. Kevin P.