Heat Controller VMH C Series Service Manual page 35

Heat Controller
9.2.2 Indoor / outdoor unit's communication error
Turn off the power supply, after 1 minute,
connect the power supply and turn on
the unit.
Check the wiring between indoor and outdoor
unit. Are the wires connected correctly?
Is all the wiring between terminal and
Indoor PCB connected properly?
Is all the wiring to the Outdoor PCB
connected correctly?
-24V<Vs<+24V DC? (Vs is the
voltage between S and N).
Change the outdoor PCB. If the AC still
displays E1, Change the indoor PCB.
VMH 30, 36 SerieS
E1 after 8 minutes
Yes
Yes
Yes
Yes
Return to normal
No
No
No
No
Change the Indoor PCB. If the AC still
displays E1, Change the outdoor PCB.
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Service Manual
Possible
electromagnetic
interference.
Reconnect and retest
Reconnect and retest
Reconnect and retest