Daikin D-Series User Manual

Troubleshooting for RA Indoor Unit Si18-525B
330 Troubleshooting
4.2 Freeze-up Protection Control or High Pressure Control
Remote
Controller
Display
A5
Method of
Malfunction
Detection

High pressure control (heat pump model only)
During heating operations, the temperature detected by the indoor heat exchanger
thermistor is used for the high pressure control (stop, outdoor fan stop, etc.)

The freeze-up protection control (operation halt) is activated during cooling operation
according to the temperature detected by the indoor unit heat exchanger thermistor.
Malfunction
Decision
Conditions

High pressure control
During heating operations, the temperature detected by the indoor heat exchanger
thermistor is above 65°C

Freeze-up protection
When the indoor unit heat exchanger temperature is below 0°C during cooling operation.
Supposed
Causes

Operation halt due to clogged air filter of the indoor unit.

Operation halt due to dust accumulation on the indoor unit heat exchanger.

Operation halt due to short-circuit.

Detection error due to faulty indoor unit heat exchanger thermistor.

Detection error due to faulty indoor unit PCB.

Daikin D-Series Specifications

General

HSPF Rating	Up to 10.0
Cooling Capacity	9, 000 - 36, 000 BTU/h
Heating Capacity	9, 000 - 36, 000 BTU/h
Energy Efficiency Ratio (EER)	Up to 12.5
Sound Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Noise Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Power Supply	208/230V, 1-phase, 60Hz