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Replaced Goodman pcbbf112s control board with icm286 control board but it shuts down and led flashes 8 times indicating thermostat problem. Do I need to replace thermostat
Remove all the low voltage control wires from the thermostat, on the terminal board there is ,
R or Red = 24 volt "hot leg"
W or White = Heat circuit.
Y or Yellow = Cool circuit
G or Green = Fan circuit.
C or Common = 24 volt "neutral leg"
The R and C terminals are the 24 volt power supply, the R being the hot leg of power, C is the side of power that every 24 volt circuit terminates upon to complete the circuit.
Just as a car battery has a Negative post that all 12 volt circuits terminate upon in a car or anything electrical , they all require 2 legs of power, some voltages are only 1 hot leg 230 volts is 2 hot legs but 115 volts and 24 volts which a thermostat controls uses 1 hot leg being the R terminal.
The thermostat has switches internally that connect the hot leg of the 24 volt power to the desired circuit, jump red to white and heat comes on, jump red to green and fan runs, jump red to yellow and the AC unit outside runs. test this out and if it operates then the thermostat is bad assuming it is wired correctly.
on Oct 15, 2019
4 blinks on a goodman gmp050
On the limits there may be a button in the center of the limit that you can depress, if it is tripped it will click and then work, the main limit is automatically reset unless it is bad, that is rare, if it will not reset it is bad.
on Oct 15, 2019
I have a goodman when everything is on outside unit busses the fan not turning and i dont no about compressor
It may be the unit will not start up because of an internal error, like low freon, etc. Go to Goodman's website and down load a pdf copy of the owners manual. There is usually a trouble shoot section at the end of the manual that can help.
If you are capable and want to trouble shoot more, search for a copy of the installation and service manuals. This information is harder to come by because Goodman wants it dealer network service people to make money servicing your unit, so it is not that public. But if you are diligent you usually can find a copy buried in some obscure HVAC technical discussion on Goodman products.
on Aug 10, 2019
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