Very helpfull , i did change the defrost board not the sensor , heat pump still frozen up , i will change both sensor video was very helpfull thank you sir !

@HVACServiceTechnicianTalk

Жыл бұрын

Glad it helped

Before I condemn the defrost board part number Trane CNT 02941. Split unit heat pump. Two defrost temp. sensors (ambient and coil). Defrost is auto "demand". Condenser ices-up. I short out force-defrost pins, unit enters defrost mode, OD fan cuts out, but ONLY 5VAC to reversing valve. Should be 24VAC in order to switch-over refrigerant direction. Reversing valve coil Ohm checks good. Both sets of sensor pins on defrost board show proper voltage at 5.5VDC. Both outdoor temp. sensors ohm out good relative to outdoor ambient temp. LED flashing normal. I had to melt the ice by shorting out force-defrost pins and temporarily jumpering R-O wires at condenser which sends 24VAC directly through defrost board to activate reversing valve. So, reversing valve is not automatically receiving proper voltage during defrost cycle. Any suggestions for other tests prior to condemning defrost board? Thanks.

Have u ever skipped the defrost board wiring and go two wire to indoor unit with only y and c ? Cuz I have the regular gas furnace no two stage but the outside unit has a defrost board in it

Every board ive seen are blinking.. some work some dont.. but that damn light.. the hell..

@gridiron2112

Ай бұрын

Mine was blinking steady on and off, which I believe is a call for cooling? The tech said it needed replacement to fix heat mode and temporarily jumpered for cooling to work. Does that sound correct?