Some control boards actually ground through 1 of the screws that mount the board to the metal surface of the blower assembly. If you pull the board and look at the backside, you may be able to see the printed circuit of the board. There will be alot of small circuits going from 1 point and another, and there will be large areas of metal within the board that act as the COMMON for the controls. And that large area of metal is connected with the lil metal posts that the screws go through and acts as a surface ground. You may not have the screw(s) through that point. OR! You may not have it wired correctly, old board damaged other components, reverse 110v polarity.
Is the 5 amp fuse good on the board? Do you have high voltage? Low voltage? Usually power going into the board but nothing going out points to a bad board. Make sure you have both high and low voltage.
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SOURCE: Mitsubishi MSH12TH heat pump air handler 110v
Wireing this type AC with the wrong voltage, will damage more than the circuit boards. I think the installer wil need to be responsible for the damage he created. The factory will also try to get out of the replacement because of the installers lack of know how.
SOURCE: Air handler
This should be doable: First get pen and paper-start at the furnace, theres a group of 5-8 wires leaving the furnace anfd going to the thermostat and a group of 2-3 going to the condenser outside that all need to be identified and the location in the furnace recorded if your furnace has a control board simply right the letter and the corresponding wire color:and whether it belongs to the condenser grp or the T-stat grp.
Furnace
R-red-to t-stat
C-yellow to cond
Y-red to cond and yellow to t-stat
G- green-to t-stat
W- white- to t-stat
If you dont have a circuit board youll be doing the same thing but using the components rather than letters;
Transformer 24v- red to t-stat
transformer 24v com -yellow to cond
Red from cond connected to yellow from t-stat
fan relay - green to t-stat
gas valve - white to t-stat
K then go to you t-stat and simply connect the corasponding component or leter to the thermostat gterminal
Cond Furnace Thermostat
yellow com- blue -C or B
gas valve or w-white -W
fan relay or g -green -G
trans 24v or R -red - R
red connection to cond or Y on board -Y
Hope this helps.
SOURCE: Rheem Air Handler will not run
We tried to bypass at the Tstat. Thanks for your time and interest.
SOURCE: My Goodman air handler RELAY, ELECTRONIC BLOWER
when this happens turn off power and feel motor if hot capicitor i dont think this board cost much but if it does you can get a fan sequenseing stack switch to repace the board with
SOURCE: 7 wire harness going to blower motor resistor
There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement
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