TemperZone UC8 - Page 12

Temperzone UC8 Troubleshooting Guide
Page 12 of 24
Display
Meaning
Possible causes
Possible remedy
CRL
Low
compression
ratio
Incorrect compressor model
selected.
Select the correct compressor model.
Compressor does not start.
Check compressor contactor.
Check compressor and contactor wiring.
CRH
High
compression
ratio
Unit is overcharged.
Remove excess refrigerant charge.
EEV does not operate
correctly.
Check settings of DIP switches 7, 8, 9, 10.
Check wiring to the EEV.
Check EEV coil is fitted properly.
Indoor fan speed too low.
Increase indoor fan speed.
Air filter is blocked.
Clean or replace air filter.
Lockout
Unit is locked
out
Unit has locked out three
times in a row without making
any successful (complete)
cooling or heating cycle.
To unlock the following steps MUST be followed
in order:
1. Press the UC8 pushbutton to unlock.
2. Fix the cause of the repeating problem.
3. Allow the unit to make at least one
successful (complete) cooling or heating
cycle.