Troubleshooting and Error Codes for Temperzone Air Conditioners in Brisbane
The list below shows all Temperzone air conditioner error codes and their possible causes, helping you identify the system’s status and issue.
Unit Controller UC7 Fault Codes
Fault Code | Description |
LP | Low pressure protection active |
HP | High pressure protection active |
HI-t | High temperature protection active |
FROSt | Indoor coil frost protection active |
HI-SL | High suction line temperature protection active |
Lo-dSH | Low discharge superheat protection active |
Hi-dSH | High discharge superheat protection active |
OL | Overload protection active (“IN #2” open circuit) |
F10 | Outdoor fan fault (no serial communications) |
F11 | Indoor fan fault (no serial communications) |
F12 | Low pressure transducer fault (shows as LP) |
F13 | High pressure transducer fault (shows as HP) |
F14 | Suction line temperature sensor fault (SL) |
F15 | Discharge line temperature sensor fault (DL) |
F16 | De-Ice temperature sensor fault (DEI) |
F17 | Outdoor coil temperature sensor fault (OC) |
F18 | Indoor coil temperature sensor fault (IC) |
F19 | Ambient temperature sensor fault (AMB) |
F20 | Superheat unknown |
F21 | Thermostat fault |
F22 | System 1 or BMS fault (no serial communications) |
F23 | System 2 fault (no serial communications) |
F24 | System 3 fault (no serial communications) |
F25 | System 4 fault (no serial communications) |
F26 | Invalid DIP switches setting |
F27 | Invalid fan selection |
F28 | Invalid economiser selection |
F29 | Controller overheating |
F30 | Supply voltage out of bounds |
F31 | A slave unit reports a fault |
F32 | 0-10V input fault |
F33 | High discharge superheat protection active |
F34 | Problem with pressures or transducer readings |
F35 | Reverse cycle valve fault |
F36 | Invalid thermostat configuration |
Display Messages (Normal Operation)
Display Message | Description |
UC7 X.XX | Name and software version (shown only after power-on) e.g. 4.95 |
0 (flashing) | Expansion valves are zeroing (shown only after power-on) |
dELAY | Unit waits for a random delay time (up to 35s, shown only after power-on) |
• (flashing) | Normal mode |
— (flashing) | Unit is OFF by Remote On/Off signal |
dE-ICE | De-icing the outdoor coil |
c | Commissioning mode (lasts for 30 minutes) |
t | Test mode (lasts about 1 minute) |
HOLd | Compressor held-on or held-off by a timer |
dr | DRED energy consumption restriction active |
• or c | No temperature display (default) |
SLP | Suction line pressure (kPa) |
Et | Evaporating temperature (°C) |
SLt | Suction line temperature (°C) |
SSH | Suction side superheat (K) |
dLP | Discharge line pressure (kPa) |
Ct | Condensing temperature (°C) |
dLt | Discharge line temperature (°C) |
dSH | Discharge side superheat (K) |
Test Function
To activate test mode:
• Thermostat and compressor must be OFF.
• Press and hold pushbutton for 2 to 4 seconds until the display shows ‘t’, then release.
Test mode starts immediately.
Outputs are activated one by one in the order listed; duration 3 seconds each and with
3 seconds pause between: R/V, CMC, OD fan Lo-Med-Hi, ID fan Lo-Med-Hi, SSR1,
SSR2, AUX. When the test sequence is completed the unit returns to normal mode.
To activate commissioning mode:
• Thermostat and compressor must be OFF.
• Press and hold pushbutton for 6 to 8 seconds until the display shows ‘c’, then release.
Commissioning mode starts immediately.
During commissioning mode timers are reduced to be able to quickly test the unit.
Commissioning mode ends after 30 minutes and returns to normal mode.
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