Panasonic WH-SDF07C3E5 Service Manual page 95
Indoor & outdoor unit air-to-water heatpump
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Also See for WH-SDF07C3E5:
- Operating instructions manual (76 pages) ,
- Service manual (158 pages) ,
- Design handbook (132 pages)
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17.5.10. Indoor Freeze Prevention Protection: Cooling (H99)
Error code will not display (no OFF/ON Control Panel LED blinking) but store in EEPROM
Malfunction Decision Conditions:
Freeze prevention control takes place (when indoor pipe temperature is lower than 0°C)
Malfunction Caused:
1. Dust accumulation on the indoor unit heat exchanger.
2. 2/3 way valve closed.
3. Refrigerant shortage (refrigerant leakage).
4. Clogged expansion valve or strainer.
5. Faulty indoor pipe temperature sensor.
6. Faulty indoor unit PCB.
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