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Heat Controller, Inc. VMH SerieS Service Manual
9.3 Trouble shooting
9.3.1 Indoor unit trouble shooting
9.3.1.1 Indoor EEPROM malfunction
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
Yes
No
Yes
Insert the EEPROM well
Replace the indoor PCB.
Shut off the power supply and
turn it on 1 minute later. Is it
still displaying the error code?
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)
Re-insert the EEPROM well
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