Friedrich Floating Air Pro-Premiere FPHW091 Service & Parts Manual page 80

Error Code 36
Error code 36
Communication trouble
Is the order of all wires
including the indoor and
outdoor unit correct?
Are all lead wires connecting
indoor and outdoor unit
loosen?
Measure the DC voltage
between SI and N then check
if the value of the voltage
change between 0V and 24V
SI and N test point:
80
TROUBLESHOOTING
Yes
Yes
Yes
No
Adjust the order of wires
No
Retighten the wires connecting
indoor and outdoor unit loosen
No
Repalce the indoor control
board
Check the DC voltage between
SI and N if the voltage change
between 0V and 24V
Yes
end
Fig. 716
No
Repalce the outdoor
control board