Manualshelf

Troubleshooting Guide

ManualsBrandsMRCOOL ManualsDIY Mini SplitsDIY 42,000 BTU 3-Ton 4-Zone Ductless Mini-Split A/C and Heat Pump 230-Volt/60Hz with 3- 35 ft. 1-66 ft. Line Set
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Troubleshooting 21
7.3 EH 02 (Zero crossing detection error diagnosis and solution)
Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time
interval is abnormal.
Recommended parts to prepare:
• Connection wires
• PCB
Troubleshooting and repair:
Check the connections and
power supply.
Correct the connections. Turn on the
unit when the power supply is good.
NO
Indoor main PCB is defective. Replace
indoor main PCB.
YES
Is it normal?
Note: EH 02 zero crossing detection error is only valid for the unit with AC fan motor, for other models, this
error is invalid.