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Heat Controller, Inc. VMH SERIES Service Manual
36
9.2.2 Indoor unit and outdoor unit communication protection error diagnosis and solution
No
Yes
Yes
No
Yes
Check the wiring between indoor and outdoor
unit. Is the connection of L, N, S and GND good?
No
Is the LED4(red) bright and LED1(yellow)
blinking on outdoor PCB?
Problem with power supply for outdoor
PCB. Check the wiring on outdoor PCB
and compare with wiring plate. Is the
connection good?
Turn off the power supply, after 1 minute, reapply the
power, turn on the unit with remote controller
Replace indoor PCB and repower
Replace outdoor e-box.
Correct the connection
Reconnect and retest
Replace the outdoor e-box
Does E1 code clear
The unit does not
work normally
E1: