TemperZone UC8 Troubleshooting Guide

Temperzone UC8 Troubleshooting Guide
Page 15 of 24
Display
Fault
Possible causes
Possible remedy
F37
Indoor unit serial
comms lost
Loose wiring.
Repair connections.
Indoor unit has no power.
Restore power to the indoor unit.
Electrical interference.
Use a twisted pair screened cable.
Signals A and B must form a pair.
Connect screen to 0V at the UC8.
Re-route cables away from other
cabling where possible.
The indoor unit should use the
same earth point as the outdoor
unit.
Faulty indoor unit controller.
Replace indoor unit controller.
F38
Indoor unit
controller reports a
fault
Loose temperature sensor wiring in
indoor unit.
Repair temperature sensor wiring
in the indoor unit.
F39
Problem with
variable speed
compressor
inverter
Loose wiring.
Repair connections.
Inverter has no power.
Restore power to the inverter.
Faulty inverter.
Replace inverter.
F40
Refer to high compression ratio protection (CRH).
F41
Refer to low compression ratio protection (CRL).
F42
High evaporating
temperature
Very high room temperature
combined with high indoor fan speed
(cooling mode).
Temporarily reduce indoor fan
speed.
Excess introduction of fresh (hot
outdoor) air.
Reduce amount of fresh air.
F43
Low condensing
temperature
Very low room temperature combined
with high indoor fan speed (heating
mode).
Temporarily reduce indoor fan
speed.
Excess introduction of fresh (cold
outdoor) air.
Reduce amount of fresh air.
Outdoor coil exposed to strong cold
wind (cooling mode).
Shelter outdoor unit from strong
winds.
F44
Invalid EEV mode
selection
Indoor unit not detected.
Ensure indoor unit powers up at
the same time, or before, the
outdoor unit.
Check wiring between outdoor and
indoor units.
Incorrect DIP switch settings.
Change DIP switch settings, then
reset the controller.

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English