Mitsubishi Electric CITY MULTI PEFY-AF1200CFM-E Technical & Service Manual page 20

[ VIII Troubleshooting ]
1. Error code
4109
Fan fault (indoor unit)
2. Error definition and error detection method
If the auxiliary relay X13 (fan fault detection) remains unexcited for a certain amount of time during operation, the unit will come
to an abnormal stop.
3. Cause, check method and remedy
Cause
(1) Thermistor trip (built-in
thermistor on the motor)
(2) Auxiliary relay (X13) fault
(3) Broken wire
(4) Loose connector
(5) Indoor unit control board
(I.B.) fault
1. Error Code
5101
Outlet air temperature sensor (TH21) fault (Indoor unit)
5102
Pipe temperature sensor (TH22) fault (Indoor unit)
5103
Gas-side pipe temperature sensor (TH23) fault (Indoor unit)
5104
Intake air temperature sensor (TH24) fault
2. Error definition and error detection method
If a short or an open is detected during thermostat ON, the outdoor unit turns to anti-restart mode for 3 minutes. When the
error is not restored after 3 minutes (if restored, the outdoor unit runs normally), the outdoor unit makes an error stop.
Short: detectable at 90°C [194°F] or higher
Open: detectable at -40°C [-40°F] or lower
Sensor error at gas-side cannot be detected under the following conditions.
During heating operation
During cooling operation for 3 minutes after the compressor turns on.
3. Cause, check method and remedy
Cause
(1) Thermistor failure
(2) Connector contact failure
(3) Disconnected wire or partial disconnected
thermistor wire
(4) Unattached thermistor or contact failure
(5) Indoor board (detection circuit) failure
HWE13100
Check method and remedy
Thermistor trip (built-in thermistor on the motor)
Check to see if the fan is not locked.
Check if the air comes out of the unit when operated in the fan mode.
Check for filter clogging.
Clean the filter if it is clogged.
Loose lead wire, broken wire, miswiring
Coil fault, contact failure
Check for broken wires.
(Check the section on simple checking for how to check for broken fan motor
wire.)
Check the connectors for proper contact.
If the above items are all normal and the problem persists, circuit board failure is
suspected.
Check the thermistor resistor.
0°C [32°F]: 15 kΩ
10°C [50°F]: 9.7 kΩ
20°C [68°F] : 6.4 kΩ
30°C [86°F] : 4.3 kΩ
40°C [104°F] : 3.1 kΩ
Check the connector contact.
When no fault is found, the indoor board is a failure.
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Check method and remedy
GB