Manualshelf

Troubleshooting Guide

ManualsBrandsMRCOOL ManualsDIY Mini SplitsDIY 39,000 BTU 3 Ton 4-Zone Ductless Mini-Split A/C & Heat Pump 230-Volt/60Hz/1-16 ft., 25 ft., 50 ft., 66 ft. Line Sets
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Troubleshooting 33
8.4 EH 60 / EH 61 / EC 53 / EC 52 / EC 54 / EC 56 / (ODU) EC 50 (Open circuit or short circuit of
temperature sensor diagnosis and solution)
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure code.
Recommended parts to prepare:
• Connection wires
• Sensors
• PCB
Troubleshooting and repair:
Check the connection between
temperature sensor and PCB.
Replace PCB
Is it within acceptable
parameters?
Is it properly wired? Ensure proper connections.NO
Measure the resistance value
of the sensor.
YES
Replace the sensor.NO
YES
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole. This picture and the value are only for reference, actual appearance
and value may vary