Carrier 58MVP instruction manual chassis ground?

18.	Do you have continuity between the N.O. (Normally Open) contact on low-pressure switch LPS and	19	3	Ð
	chassis ground?
19.	The ORANGE wire from low-pressure switch LPS is shorting to ground. Replace or repair it.	Ð	Ð	9
20.	Does Fault Code 24 occur when gas valve GV is energized?	21	28	Ð
21.	Disconnect jumper wire across R and W/W1 thermostat terminals and replace secondary voltage	Ð	Ð	22
	fuse.
22.	Disconnect BLUE wire to gas valve GV and jumper R and W/W1 thermostat terminals on furnace	Ð	Ð	23
	control board.
23.	Does Fault Code 34 IGNITION PROVING FAULT occur? If not, Fault Code 24 should occur when	27	24	Ð
	BLUE wire is energized.
24.	Disconnect PL1 from furnace control board.	Ð	Ð	25
25.	Do you have continuity between BLUE wire and chassis ground?	26	3	Ð
26.	The BLUE wire to gas valve GV is shorting to ground. Replace or repair it.	Ð	Ð	9
27.	Replace gas valve GV.	Ð	Ð	4
28.	Add a jumper across R and W2 thermostat terminals on furnace control board.	Ð	Ð	29
29.	Does Fault Code 24 occur when high-pressure switch HPS is energized?	30	39	Ð
30.	Disconnect jumper wire across R, W/W1, and W2 thermostat terminals and replace secondary volt-	Ð	Ð	31
	age fuse.
31.	Disconnect BROWN wire to gas valve GV and jumper R, W/W1, and W2 thermostat terminals on	Ð	Ð	32
	furnace control board.
32.	Does Fault Code 24 occur when high-pressure switch HPS is energized?	33	27	Ð
33.	Disconnect PL1 from furnace control board.	Ð	Ð	34
34.	Do you have continuity between BROWN wire and chassis ground?	35	36	Ð
35.	The BROWN wire to gas valve GV is shorting to ground. Replace or repair it.	Ð	Ð	9
36.	Disconnect PL2 from furnace control board.	Ð	Ð	37
37.	Do you have continuity between the N.O. (Normally Open) contact on high-pressure switch HPS	38	3	Ð
	and chassis ground?
38.	The BROWN wire from high-pressure switch HPS is shorting to ground. Replace or repair it.	Ð	Ð	9
39.	Disconnect jumper wire across R, W/W1, and W2 thermostat terminals and wait until blower stops.	Ð	Ð	40
40.	Jumper R, G, and Y/Y2 thermostat terminals on furnace control board.	Ð	Ð	41
41.	Does Fault Code 24 occur when G and Y/Y2 are energized?	3	42	Ð
42.	Reconnect all thermostat leads (except HUM terminal if used) to furnace control board and operate	Ð	Ð	43
	furnace in heating and cooling mode from thermostat.
43.	Does Fault Code 24 occur during heating cycle?	44	45	Ð
44.	You have a defective thermostat or a short circuit in wiring between thermostat and furnace.	Ð	Ð	9
45.	Does Fault Code 24 occur during cooling cycle?	46	47	Ð
46.	You have a defective thermostat or a short circuit in wiring between thermostat and outdoor unit.	Ð	Ð	9
47.	Does problem usually occur in cooling mode?	48	49	Ð
48.	Check outdoor unit contactor. Failure to pull in can cause excessive current draw on low-voltage	Ð	Ð	9
	circuit. This can be an intermittent problem.
49.	Reconnect humidifier and check for excessive current draw.	Ð	Ð	9

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