Midea MRBT-60CWN1-D - Troubleshooting: Controller, Protection, and Fan Errors

60Hz R410A ClimaMaster Tropical Rooftop Package Unit MCAC-RTSM-2015-01
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2) E9：Indoor coil temp. sensor T2 default.
(Indoor temp. and Pipe Temp. Sensor Resistance Value Table, see Appendix 2)
3) When E2,E5,E6 or EA displays, please check the wired nameplate, if the terminals of T2_1、T2_2、
T3_2、T4 are connected as short circuit. If no, please connect all as short circuit, unless replace
main board.
4) Eb: Wired controller output error.(Only for KJR-23B or KJR-25B).
Avoid three conditions as following:
1) The wired controller output signal has Y, no G.
2) The wired controller output signal has W, no G.
3) The wired controller output signal has Y and W, no G.
6). P0：Compressor over current protection.(The over current protection value is 16A)
7). P3：Comprehensive protection for outdoor fan
Detect if the temp. Sensor is normal.
Replace the main board.
Yes
Replace the temp. sensor,
detect it again.
No
Detect B phase current, if the current
value is over the setting value.
The main board display P0, normal.
Detect if the three-phase
protector display is normal.
The main board display P3,
normal.
Detect by multi-meter if
three-phase protector COM
and NO exist current circuit.
Replace three-phase
protector, detect it again.
Yes
No
Replace the main board.
No
Yes
No
Yes
Replace the main board.