TemperZone UC8 Troubleshooting Guide

Temperzone UC8 Troubleshooting Guide
Page 11 of 24
Display
Meaning
Possible causes
Possible remedy
HI-SL
High suction
line
temperature
protection
Insufficient refrigerant.
Add refrigerant.
Very high room temperature
(cooling mode).
Reduce indoor fan speed (temporarily).
Very high outdoor ambient
temperature (heating mode).
Do not operate the unit in heating mode with
very high outdoor ambient temperature.
Faulty suction line
temperature sensor.
Replace sensor.
Lo-dSH
Low discharge
superheat
protection
Unit is overcharged.
Remove excess refrigerant charge.
Discharge line temperature
sensor not properly fitted.
Securely fit the temperature sensor on the
compressor discharge pipe and insulate.
Suction line temperature
sensor not properly fitted.
Securely fit the temperature sensor on the
compressor suction pipe and insulate.
Faulty discharge line
temperature sensor.
Replace sensor.
Incorrect expansion valve
selection
Correct the DIP switch settings for switches 7, 8,
9 and 10
HI-dSH
High discharge
superheat
protection
Loss of refrigerant.
Find refrigerant leak and repair. Replace
refrigerant with correct charge.
Faulty discharge line high
pressure transducer.
Replace transducer.
Suction line temperature
sensor not properly fitted.
Securely fit the temperature sensor on the
compressor suction pipe and insulate.
Incorrect expansion valve
selection
Correct the DIP switch settings for switches 7, 8,
9 and 10
LO-t
Water freeze
protection
Insufficient flow of water
Ensure water circulating pump operates.
Ensure water valves are open.
Bleed air out of the water circuit to prevent air-
locks.
Supply water temperature too
low.
Ensure supply water temperature is above
+10°C.
Lack of refrigerant charge.
Add refrigerant.
FLOOd
Sump
condensate
flooding
protection
Condensate drain pipe is
blocked
Unblock condensate drain pipe.
Condensate drain pipe slope is
insufficient
Increase pipe slope or install sump condensate
pump and float switch.
No U-trap installed
Install U-trap
Faulty sump condensate float
switch.
Replace float switch.
Faulty sump condensate
pump.
Replace pump.
OL
Overload
protection
Indoor fan is overloaded.
Check indoor fan.
Check airflow is not obstructed.
Outdoor fan is overloaded.
Check outdoor fan.
Check airflow is not obstructed.
Compressor overheated.
Wait until compressor has cooled down
sufficiently. Check system has adequate
refrigerant charge. System design must ensure
adequate return of compressor lubricating oil.
Faulty wiring / connection to
input IN#2.
Repair wiring.

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English