Indoor Unit Trouble Shooting; Indoor Eeprom Malfunction - Heat Controller A-VMH18DC-1 Service Manual

Heat Controller, Inc.
9.3 Trouble shooting
9.3.1

Indoor unit trouble shooting

9.3.1.1 Indoor EEPROM malfunction

Shut off the power supply and
turn it on 1 minute later. Is it
still displaying the error code?
Yes
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
Yes
Replace the indoor PCB.
EEPROM: a read-only memory chip whose contents can be erased and reprogrammed using a pulsed
voltage.
(EERROM chip may be solid for some models)
VMH SerieS
No Re-insert the EEPROM well
Insert the EEPROM well
27
Service Manual