TemperZone UC8 User Manual

Temperzone UC8 Operation, OSA models with inverter, issue 1
Page 23 of 27
Display
Meaning
Possible causes
F12
Low pressure transducer fault
Transducer cable disconnected
Faulty transducer
Loss of refrigerant (gas leak)
F13
High pressure transducer fault
Transducer cable disconnected
Faulty transducer
Loss of refrigerant (gas leak)
F14
Suction line temperature sensor fault
Sensor cable disconnected
F15
Discharge line temperature sensor fault
Sensor cable disconnected
F18
Indoor coil temperature sensor fault
Sensor cable disconnected
F19
Heating element temperature sensor fault
Sensor cable disconnected
F20
Superheat is unknown
Missing sensor
F21
Thermostat fault
Loss of serial communications
F22
BMS fault
Loss of serial communications
F26
Invalid DIP switches setting
F29
Microcontroller too hot
Inadequate electrical box ventilation
F30
Supply voltage out of bounds
Electrical short circuit / overload
F33
High discharge superheat protection
Loss of refrigerant (gas leak)
Faulty transducer
EEV malfunctioning or disconnected
F34
Pressures not equalising
Pressure transducer connections
swapped
Incorrect pressure transducer fitted
EEV malfunctioning or disconnected
F35
Reverse cycle valve fault
Reverse cycle valve disconnected
F36
Invalid DIP switch setting on TZT-100
thermostat
Set TZT-100 DIP switch 2 ON
and TZT-100 DIP switch 4 OFF
F39
Variable speed compressor driver reports a
fault
Check inverter driver
F42
Evaporating temperature too high
Supply water temperature too high
(heating mode)
EEV malfunctioning or disconnected
F43
Condensing temperature too low
Supply water temperature too low
(cooling mode)
EEV malfunctioning or disconnected
F44
Invalid EEV mode selection

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English