Lennox G21Q3-40

Page 64
YES
END OF TEST
HEATING MODE
(contd.)
NO
REPLACE VSP1.
DS3 DS2 DS1
CHECK UNIT WIRING AND IF CORRECT
REPLACE THE VSP1.
IN ADDITION TO R AND W1,
JUMPER R AND W2.
REMOVE JUMPERS
AFTER THE SELECTED TIME
DOES
BLOWER TURN OFF?
IN ADDITION TO R AND W1,
JUMPER HB AND W2.
REMOVE HB AND W2 JUMPER
DS3 DS2 DS1
L1
ACC
YES
NO
DOES BLOWER SHIFT TO
HIGH HEAT SPEED AND
ARE DS1 AND DS2 LIT?
NO
DOES BLOWER SHIFT TO
HIGH HEAT SPEED AND
ARE DS1 AND DS2 LIT?
DS3 DS2 DS1
CHECK UNIT WIRING AND IF CORRECT
REPLACE THE VSP1.
YES
1
J73
1
3
6912
J73
V" BLOWER AND VSP1 BLOWER CONTROL BOARD
HEATING MODE CHECKOUT (contd.)
START HERE
1
VSP1