Carrier 58MVP instruction manual →44

Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death.

→44.	Remove tape from door switch and turn power off at main disconnect.	Ð	Ð	45
→45.	Disconnect PL10 from blower assembly.	Ð	Ð	46
→46.	Remove control box assembly from blower shelf and position out of the way.	Ð	Ð	47
→47.	Remove blower assembly from furnace.	Ð	Ð	48
→48.	Disconnect both multi-pin connectors from blower control module attached to the blower motor. Be	Ð	Ð	49
	sure to depress release latches on connectors or they may get damaged.
→49.	Remove two 1/4-in. hex head bolts from blower control module attached to blower motor. DO NOT	Ð	Ð	50
	REMOVE TORX HEAD SCREWS located next to 1/4-in. hex head bolts.
→50.	Carefully lift blower control module off blower motor. Depress latch on internal connector to discon-
	nect blower control module from motor portion of blower motor. DO NOT PULL ON WIRES. GRIP	Ð	Ð	51
	PLUG ONLY.
	When blower control module is completely detached from blower motor, verify with standard ohm-
	meter that the resistance from each motor lead in motor plug to unpainted motor end plate is
→51.	greater than 100k ohms. Then verify motor windings are not shorted or open by measuring resis-	Ð	Ð	52
	tance between each combination of pins in motor plug (there are three different combinations, pin
	1-2, pin 2-3, and pin 1-3). Resistance should be approximately equal across each combination of
	pins.
→52.	Did the motor pass the resistance check?	53	55	Ð
→53.	Does blower wheel turn freely with blower control module removed?	54	55	Ð
→54.	Replace blower control module. Inspect failed blower control module for water damage. If present,	Ð	Ð	5
	find source of water and fix. Check A-coil and/or humidifier.
→55.	Replace entire blower motor including blower control module. Inspect blower control module for wa-	Ð	Ð	5
	ter damage. If present, find source of water and fix. Check A-coil and/or humidifier.

Fault Code 13

LIMIT SWITCH LOCKOUTÐThis fault indicates the limit switch has tripped 10 times in a row in high fire or 3 times in a row in low fire during a call for heat. Control will auto-reset in 3 hr.

NOTE: After 2 low-fire limit trips, the control is locked into high-heat mode; however, a third low-heat cycle can be forced due to excessive restriction in air delivery system.

NOTE: Boards with date codes of 9506 or later will lock into high-heat mode after 2 low-fire limit trips and CANNOT be forced into a third low-heat cycle. Therefore, units with these boards can only lock out if the limit switch trips 10 times in a row in high fire during a call for heat.

STEP	ACTION	YES	NO	GO TO
1.	Turn power off and remove blower access panel. Disconnect all thermostat leads from furnace con-	Ð	Ð	2
	trol board.
2.	Depress door switch. Use a piece of tape to hold switch closed.	Ð	Ð	Ð
3.	Put setup switch SW-1 in ON position.	Ð	Ð	4
	Is a Fault Code 44 present in the fault history.
4.	NOTE: Read fault codes until they repeat. The last fault code that occurred will flash first fol-	46	5	Ð
	lowed by the lowest number fault code. (EXAMPLE: 13, 13, 44)
5.	Put setup switch SW-1 in OFF position.	Ð	Ð	42
6.	Does furnace have proper limit switch, limit shield, blower baffle (if used), and rear air baffle (if	10	48	Ð
	used)? If so are limit switch, limit shield, and heat exchangers properly aligned?
7.	Replace limit switch.	Ð	Ð	9
8.	Replace furnace control board.	Ð	Ð	9
9.	Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.	Ð	Ð	INDEX
10.	Put setup switch SW-2 in ON position.	Ð	Ð	11
11.	Jumper R and W/W1 thermostat terminals on furnace control board.	Ð	Ð	12
12.	Is furnace considerably overfired (10% or more)? Clock input rate. Do not use manifold pressure	13	14	Ð
	method unless using propane.
13.	Ensure gas inlet pressure and burner orifices (natural or propane) are correct. Then adjust gas
	valve to proper rate per Installation, Start-Up, and Operating Instructions. If it cannot be adjusted to	Ð	Ð	9
	proper rate, replace gas valve.
14.	Is the personality connector PL5 properly wired per furnace model sizing chart in upper left-hand	50	15	Ð
	corner of wiring schematic?
15.	Replace or rewire personality connector.	Ð	Ð	9

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