Carrier 40MAQB09B--3 - Voltage Protection Error Diagnosis (E5)

43
E5(Voltage protection) error diagnosis and
solution.
Error Code E5
Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Supposed causes
S Power supply problems
S System leakage or block
S PCB faulty
Troubleshooting
Voltage protection
Check the voltage of
outdoor unit power supply,
whether the voltage
between L(L1) and N (L2) is
about 187~253VAC
Check the power supply
Check whether the voltage
of IPM board P and N is
normal? DC277-356V for
18-27KBtu/h; DC277-410V
for 36KBtu/h
Replace bridge rectifiers,
and then check whether the
system can run
normally
(Only for qua-
zone)
Replace IPM board, and
then check whether the
system can run normally
Replace outdoor main board
Yes
No
No
No
No
Yes
Trouble is solved
Yes
Yes