Midea MRBT-60CWN1-D - Troubleshooting: Sensor, Protection, and Valve Issues

MCAC-RTSM-2015-01 60Hz R410a ClimaMaster Tropical Rooftop Package Unit
75
2) Compressor didn’t run (All wires connection are correct and reliable, if power supplier is
required range. If compressor didn’t run, you can analysis as flowing)
3) T3 temp sensor error.
4) Check if the low pressure protection is normal.
Yes
Yes
No
No
Yes
Yes
No
Yes
No
Yes
No
No
Is the electric resistance of T3 answer for
Appendix 1
?
Detect if the voltage of compressor which
corresponds to the interface on PCB is 208 ~
230V AC between CN6 of COMP1, COMP2
and N.
If indoor fan motor contactor is
close.
Detect if the fuse on PCB is burned
off.
Replace
compressor.
Replace
contactor.
Replace fuse.
Check if the secondary voltage
transformer is normal.
Replace
PCB.
Replace
transformer.
1
：
Check if the refrigerant in system is less.
2
：
Detect if system have blocked
3
：
Check if the four-valve is broken.
4
：
Detect if low-pressure switching ontology is bad,
replace the low-voltage switch.
Replace PCB.
Replace the T3 sensor.
Check if the low pressure protection is normal
(The normal resistance is 0Ω).
Replace PCB.