Dometic MCS T6 Operating Manual page 30

Troubleshooting
9.3 Control Panel Troubleshooting
Problem
Control panel is not lit.
Fan is not running or
runs continuously.
Fan is not running but
the compressor is.
Fan runs continuously
although it is set to cycle
with compressor.
No cooling or heating.
No heat.
Unit switches to heat
while in Cool Mode.
Fan coil is iced.
30
Possible Reason
8-pin display cable plugs are not
making contact (unplugged, dirty,
bent, or broken pins).
The Marine Climate System is pro-
grammed for either fan cycling with
compressor or continuous fan opera-
tion.
Failed triac on control panel circuit
board.
Failed triac on control panel circuit
board.
The Marine Climate System is pro-
grammed for heat or cool only.
"HPF" or "LPF" is displayed.
The Marine Climate System may be
set to Electric Heat, not Reverse
Cycle.
De-icing feature enabled due to coil
icing up.
Improper airflow.
MCS T6, MCS T12, MCS T16
Solution
Power off at the circuit breaker.
Remove connector and inspect.
If damaged, replace connector or
entire display cable.
Reprogram parameter P-14.
Note: After the compressor cycles
off, the fan will continue to run for
2 min in Cool Only Mode and 4 min
in Heat Only Mode regardless of
parameter setting.
Send for repair or call local service
technician.
Send for repair or call local service
technician.
Reprogram parameter P-1.
See below.
Reprogram parameter P-15.
Reprogram parameter P-8
See corresponding section in "Gen-
eral Troubleshooting" on page 24,
before reprogramming the Marine
Climate System.
Reprogram parameter P-8 to enable
de-icing.
If de-icing cycle does not melt ice,
switch air conditioning unit to heat
until ice melts or use hair dryer to
melt ice.
If problem persists, reprogram Low
Fan Speed Limit for maximum value:
Set P-3 to 64.
EN