TemperZone UC8 Troubleshooting Guide

Temperzone UC8 Troubleshooting Guide
Page 18 of 24
SAT-3 + UC8 fault codes
SAT-3
display code
UC8 display
code
Fault
Notes
Blank
●
No faults
A4
Lock out
UC8 display shows the cause.
A1 A4
HP
HP trip
A1 A5
LP
LP trip
A3 A6
OL
Overload
A1 A6
Frost
Indoor coil frost protection
A5 A6
Lo-t
Water freeze protection
HWP and chillers only.
A1 A7
Hi-t
Discharge line high temperature
A1 A8
Hi-SL
Suction line high temperature
A5 A7
Flood
Flooded condensate sump
HWP only.
A5 A8
No-Flo
No circulating water flow
HWP and chillers only.
A3 A4
Lo-DSH
Low discharge superheat
A3 A7
F10
Outdoor fan fault
F11
Indoor fan fault
A3 A8
F12
Low pressure transducer
F13
High pressure transducer
F14
Suction line temp sensor
F15
Discharge line temp sensor
F16
De-ice ambient sensor
F17
Outdoor temp sensor
F18
Indoor coil temp sensor
F19
Outdoor ambient sensor
A1 A2 A8
F20
Superheat unknown
A1 A2 A4
F21
No communications, thermostat
Code cannot be shown.
A2 A4
F22
No communications, BMS
A2 A5
F23
No communications, system 2
A2 A6
F24
No communications, system 3
A2 A7
F25
No communications, system 4
A1 A2 A6
F26
Cannot read DIP switches
F27
Illegal fan selection
F28
Illegal mode
F29
High board temperature
F30
Supply voltage brown-out
A2 A3 A4
F31
Slave reports a fault
A1 A2 A6
F32
UC8 internal problem
Same code as F26…F30.
A3 A5
Hi-DSH
High discharge superheat
A4 A8
F34
Pressures not equalising
A2 A3
F35
Reverse cycle valve fault
A1 A2
F36
TZT-100 DIP switch setting
Code cannot be shown.
A2 A8
F37
No communications, IUC
A7 A8
F38
IUC reports a fault
A6 A7
F39
Inverter reports a fault
A4 A5
F40
Compression ratio too high
A4 A6
F41
Compression ratio too low
A4 A7
F42
Evaporating temp too high
A4 A8
F43
Condensing temp too low
A1 A2 A5
All other UC8 faults

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English