MCAC-RTSM-2012-01 M-thermal Technical Manual (part 2)
Part 2 trouble shooting
1. Normal Phenomenon ................................................................................................................................................ 2
2. M-thermal system protection in Common ........................................................................................................... 3
3. Trouble and causes of heat pump ......................................................................................................................... 3
4. Malfunction Code and Troubleshooting ............................................................................................................... 4
4.1 Outdoor unit malfunction Code and troubleshooting .......................................................................... 4
A. "E0": Outdoor unit EEPROM malfunction ...................................................................................... 5
B. "E2": Communication error of the outdoor chip and the indoor chip ............................................. 6
C. "E3": Communication error of outdoor chip and DSP ................................................................... 7
D. "E4": Outdoor temperature sensor error ............................................................................................... 8
E. "E5": Voltage protection error ................................................................................................................. 9
F. "E6": Direct-current fan error ................................................................................................................ 10
G. "P1": High pressure protection .................................................................................................... 11
H. "P2": Low pressure protection ..................................................................................................... 12
4.2 Hydraulic indoor unit malfunction Code and trouble shooting ....................................................... 13
A. "E0" "E8": Flow switch error ........................................................................................................ 14
B. “E1 E3 E4 E5 E6 E7 E8 E9 EA Eb”: Temperature sensor error .................................................. 15
C. "E2": UI communication error ...................................................................................................... 16
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