Daikin EHYHBH05AAV3 Service Manual page 96

Error Codes: Hydro-box
“CJ, C4, 81, 80, HC, H1” Thermistor or Related Abnormality (Hydro-box)
3.3
1
User interface
display
Method of
malfunction
detection
Malfunction
decision conditions
3
Supposed causes
4
Troubleshooting
5
Part 4 – Troubleshooting
CJ, C4, 81, 80, HC, H1
The temperatures detected by the thermistors are used to determine thermistor errors.
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation*.
* (reference)
When above about 212°C (less than 120 ohms) or below about –50°C (more than 1,860 kOhms).
Note: The values vary slightly in some models.
Faulty connector connection
Faulty thermistor
Faulty PCB
CJ : Room temperature thermistor
HC:
Tank temperature thermistor
C4:
Hydro-box heat exchanger thermistor
81:
Leaving water temperature thermistor
80:
Return water temperature thermistor
(*) See also "Check No.4 - Resistance Conversion Table (Ambient, Coil, Fin)" on page 153.
96
ESIE13-02A