Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

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[7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ]
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- chapter 7 BS_07_E
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3. Cause, check method and remedy
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7-7-3 Error Code [5110]
1. Error code definition
Heatsink temperature sensor (THHS) fault (Detail code 01)
2. Error definition and error detection method
When a short or an open of THHS is detected just before or during the inverter operation.
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
Cause Check method and remedy
(1) Thermistor failure Check thermistor resistance.
(2) Pinched lead wire Check for pinched lead wire.
(3) Torn wire coating Check for wire coating.
(4) A pin on the male connector is missing or
contact failure
Check connector.
(5) Disconnected wire Check for wire.
(6) Thermistor input circuit failure on the control
board
Check the intake temperature of the sensor with the LED
monitor.
When the temperature is far different from the actual temper-
ature, replace the control board.
Short detection Open detection
TH2 70°C [158°F] and above (0.4k Ω ) -40°C [-40°F] and below (130k Ω )
TH3 110°C [230°F] and above (0.4k Ω ) -40°C [-40°F] and below (130k Ω )
TH4 240°C [464°F] and above (0.57k Ω ) 0°C [32°F] and below (698k Ω )
TH5 70°C [158°F] and above (0.4k Ω ) -40°C [-40°F] and below (130k Ω )
TH6 70°C [158°F] and above (1.14k Ω ) -40°C [-40°F] and below (130k Ω )
TH7 110°C [230°F] and above (0.4k Ω ) -40°C [-40°F] and below (130k Ω )
TH15 110°C [230°F] and above (0.4k Ω ) -40°C [-40°F] and below (130k Ω )
Cause Check method and remedy
(1) INV board failure If the problem recurs when the unit is put into operation, replace the INV board.
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