Lennox VHA 30, Installation Operating & Maintenance Manual, Page: 35 / 46

–34–
3) No heater operation works
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Is the heating operating?
Is the Compressor
operating?
Is the Heat S/W of Main
PCB "ON"?
Heat S/W "ON"
Heater S/W "ON"
Replacement MICOM
Replacement IC02M
Replacement RY-HEATER
Is the heater S/W of Main
PCB"ON"?
Is the DC 5V at 15 pin of
MICOM
Is the DC 12V
at eack terminal? (RY-HEATER
COIL)
Is the
AC220V (AC 240 V) between
connector(HEATER) and CN-outunit of
Main P.C.B
Check the heater wiring
Select the heating operation mode.
Compressor "ON"