Search found 4 matches

by Schoolie
Wed Jul 27, 2011 1:57 am
Forum: Nordyne Service & Repair
Topic: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off
Replies: 5
Views: 5050

Re: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off

Bill, Lo and Behold, I found the wiring diagram. And solved the problem. By the way, the top of the wiring diagram says, "A/C Blower Relay Control Model 901994. For use with a 2 wire thermostat" which doesn't make sense to me since I still need 3 wires to control both the Heating and Cooling. Not su...
by Schoolie
Tue Jul 26, 2011 11:23 am
Forum: Nordyne Service & Repair
Topic: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off
Replies: 5
Views: 5050

Re: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off

Bill, One other thing I just thought of: When the funace control switch is in Cool position, I get 27v across the C and Y terminals. But that is to be expected, since the A/C compressor does come on with the furnace switch in Cool position. A question you may have next, and I don't yet have an answe...
by Schoolie
Tue Jul 26, 2011 11:05 am
Forum: Nordyne Service & Repair
Topic: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off
Replies: 5
Views: 5050

Re: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off

Hi Bill, This is my daughter's house, so I have to travel back there to do further investigation. I am going to go back, trace as many of the wires down as I can, and get as many voltage measurements as I can in all modes. She purchased the home during cold weather and so this is the first summer th...
by Schoolie
Sat Jul 23, 2011 11:37 am
Forum: Nordyne Service & Repair
Topic: Nordyne MGHA-090ABPQ-01 T-stat A/C on/off
Replies: 5
Views: 5050

Nordyne MGHA-090ABPQ-01 T-stat A/C on/off

I have a Nordyne model MGHA-090ABPQ-01 furnace with A/C. The control box on the front of the furnace has a Heat-Off-Cool switch and a Fan On-Auto switch. The furnace also has a System On-Off-Fan switch. Terminal connections on the control box are C, Y, R, and W (no G) Connections on the new digital ...