Carrier 58MVP instruction manual Does fault occur again?

4.	Observe operation of furnace for several minutes or until fault occurs.	Ð	Ð	5
5.	Does fault occur again?	9	6	Ð
6.	Does a different fault occur?	7	8	Ð
7.	Go to page number indicated in Index for fault code flashed.	Ð	Ð	INDEX
8.	Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.	Ð	Ð	INDEX
9.	Is collector box and inducer housing properly draining condensate?	11	25	Ð
10.	Fix problem.	Ð	Ð	8
11.	Are pressure switches wired correctly?	13	10	Ð
12.	Replace pressure switch assembly.	Ð	Ð	8
13.	Do you have 24v between C (Common) on low-pressure switch LPS and Com on furnace control	15	14	Ð
	board?
14.	The YELLOW wire to low-pressure switch LPS is not making good connection. Repair wire or re-	Ð	Ð	8
	place harness.
15.	Turn power off and disconnect jumper wire across R, W/W1, and W2 thermostat terminals. Turn
	power on and wait a few sec for self test, then reconnect jumper across R, W/W1, and W2 thermo-	Ð	Ð	16
	stat terminals.
16.	Do you have 24v between connector terminal PL2-2 and Com on furnace control board when fault	21	18	Ð
	occurs?
17.	Replace furnace control board.	Ð	Ð	8
18.	Turn power off.	Ð	Ð	19
19.	Do you have continuity across terminal PL2-2 and N.O. (Normally Open) contact on low-pressure	12	20	Ð
	switch LPS?
→20.	The ORANGE wire from low-pressure switch LPS to furnace control board is not making good con-
	nection or low gas pressure switch LGPS (when used) is open. Check propane line pressure if us-	Ð	Ð	10
	ing LGPS otherwise repair wire or replace harness.
21.	Turn power off and disconnect jumper wire across R, W/W1, and W2 thermostat terminals. Discon-
	nect BROWN wire from N.O. (Normally Open) contact on high-pressure switch HPS. Turn power on	Ð	Ð	22
	and wait a few sec for self test, then reconnect jumper across R and W/W1 thermostat terminals.
22.	Does a Fault Code 32 occur?	17	23	Ð
23.	Reconnect BROWN wire to N.O. (Normally Open) contact on high-pressure switch HPS.	Ð	Ð	24
24.	The problem may be caused by a sag in vent pipe. If this is not the problem and fault still occurs,	Ð	Ð	8
	replace pressure switch assembly.
25.	The vent tube to drain trap, drain trap, or drain line is clogged.	Ð	Ð	10

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