York P2MPD16N06401A blower always on - http://www.hvacmechanic.com/ Forums
Original message
| ed2tronics
 |  "York P2MPD16N06401A blower always on"
, posted Sat 15 Dec 02:57:  
The thermostat calls for heat, blower turn on, after a few seconds the pilot will light up together with the inducer motor. Burners turns on and pilot turns off, but the inducer motor still on. when thermostat is satisfied, burners turn off and the blower wont turn off.It seems there something wrong with the sequence.
I disconnected the blower cool wire from the board and call for heat, inducermotor turns on, then the pilot turns on, burner turns on then pilot turns off. This is normal, but the problem the blower wont turn on, the burner turns off and 4 flashing indicator (high limit)comes on. Is there a problem with the board....pls help
ed2tronics
[this message was edited by ed2tronics on Sun 16 Dec 01:24] |
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| mule
| "Re(1):York P2MPD16N06401A blower always on" , posted Sat 15 Dec 10:45
Lots of info!Not sure i follow.Here what i Know (think).,High limit is to sense "overheat" and board is designed to have blower on when sensed.,to remove heat! Is furnace overheating? plugged filters,choked off duct work, plugged a-coil dont condemn L.S. for doing its job. To reset furnace disconnect power source.,retry.L.S. are N.C. u can test with ohm or cont. tester. Why are u taking cool wire off.Thats for a/c.,look for heat peg.
"Its only Tin!"
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| | ed2tronics
| "Re(2):York P2MPD16N06401A blower always on" , posted Sun 16 Dec 02:10
I dir reset by unplugging the unit. Upon call for heat, motor starts to on all the time, even the unit is cold. Followed by the sequence, pilot and draft on, burners on pilot off, unit works fine, except for the blower wont stop.
I turned off the unit and disconnected the blower cool wire, just to check where the supply voltage to the blower coming from. Call for a heat while it is disconnected, blower did,t come on (wow) then pilot and draft on, burners on pilot off, except blower did'nt turn on. Burners shut off due to high limit switch open, 4 flashing led.
It seems the board is switching the blower relay to cool position, any idea..is the board bad..pls
ed2tronics
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