Carrier 58mvp inducer motor

Carrier 58mvp inducer motor DEFAULT

Fault code 42 – Carrier 58MVP User Manual

background image

Fault Code 42

INDUCER OUTSIDE VALID SPEED RANGE—This fault indicates that inducer motor is not operating at
calculated RPM or has not started within 10 sec after a call for heat.

STEP

ACTION

YES

NO

GO TO

1.

Turn power off, remove blower access panel, and disconnect all thermostat leads from furnace con-
trol board.

2

2.

Turn power on and depress door switch. Use a piece of tape to hold switch closed.

3

3.

Jumper R and W/W1 thermostat terminals on furnace control board.

4

4.

Observe operation of furnace for next 8 minutes or until fault occurs.

5

5.

Does fault occur again?

9

6

6.

Does a different fault occur?

7

60

7.

Go to page number indicated in Index for fault code flashed.

INDEX

8.

Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS.

INDEX

9.

Does fault occur within 11 sec after a call for heat?

52

35

10.

Do you have 120v between

I

1 and

I

2 on furnace control board?

11

14

11.

Do you have 120v between terminals PL7-6 and PL7-12?

13

12

12.

You have an open wire or bad terminal on either the BLACK or WHITE wire between furnace con-
trol board and inducer motor MTR1.

14

13.

Are all pins and wire leads intact on connectors between furnace control board and inducer motor?

15

14

14.

Fix problem.

8

15.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals. Turn power
on and wait a few sec for self test before proceeding to next step.

16

16.

Put setup switch SW-4 for EMER. HEAT in ON position.

17

17.

Jumper R and W/W1 thermostat terminals on furnace control board.

18

18.

Does inducer motor turn on?

30

19

19.

Does inducer wheel rub against inducer housing?

14

20

20.

Turn power off.

21

21.

Does inducer wheel turn freely?

24

22

22.

Replace inducer motor or inducer motor assembly.

8

23.

Replace furnace control board.

8

24.

Disconnect jumper wire across R and W/W1 thermostat terminals and put setup switch SW-4 for
EMER. HEAT in OFF position.

25

25.

Turn power on and wait a few sec for self test before proceeding to next step.

26

26.

Check 12-vdc line. To do this, connect a DC voltmeter across terminals PL1-6 BROWN (+) and
PL1-7 GREEN (-). Is voltage across BROWN and GREEN wires 11.5 — 12.5 vdc?

27

23

27.

Turn power off.

28

28.

Do you have continuity between PL7-2 and PL1-6?

22

29

29.

You have an open wire or bad terminal on BROWN wire between connectors PL7 and PL1.

14

30.

Disconnect jumper wire across R and W/W1 thermostat terminals and put setup switch SW-4 for
EMER. HEAT in OFF position.

31

31.

Check RPM feedback line. To do this, connect a DC voltmeter across terminals PL1-6 BROWN (+)
and PL1-5 ORANGE (-), then put setup switch SW-6 for COMPONENT TEST in ON position. Does
voltage across BROWN and ORANGE wires change between states as shown below?

• State 1—OFF (11.5 — 12.5 vdc)
• State 2—LOW (10.2 — 11.2 vdc)
• State 3—HIGH (8.4 — 9.4 vdc)

23

32

32.

Turn power off.

33

33.

Do you have continuity between PL7-1 and PL1-5?

22

34

34.

You have an open wire or bad terminal on ORANGE wire between connectors PL7 and PL1.

14

35.

Does fault occur a few sec after low-pressure switch LPS makes?
NOTE: Check for 24v between the N.O. (Normally Open) contact on low-pressure switch LPS
and Com on furnace control board to know when low-pressure switch LPS makes.

36

48

36.

Is inducer motor rotating in direction shown on inducer housing?

37

22

37.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals.

38

38.

Connect 1 side of a slope manometer with a tee to collector box pressure tap. Connect other side
with a tee to gas valve air pressure fitting. Refer to pressure check diagram in Appendix C.

39

39.

Turn power on and wait several sec, then jumper R and W/W1 thermostat leads on furnace control
board.

40

40.

Do you have more than 1.0 in. wc pressure drop (0.80 in. wc on trophy unit) across heat exchang-
ers when low-pressure switch LPS makes?
NOTE: Check for 24v between the N.O. (Normally Open) contact on low-pressure switch LPS
and Com on furnace control board to know when low-pressure switch LPS makes.

47

41

41.

Turn power off.

42

42.

Is inducer blower wheel okay?

44

43

29

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be installed in upflow, downflow, or

horizontal positions covering up to

24 different applications.

The versatile 4-way multipoise design

in conjunction with variable capacity

makes the 58MVP ideal for use with

split-system cooling, including

2-speed units. A Carrier electronic

air cleaner, humidifier,

Thermidistat™, comfort ventilator,

TM

and Comfort Zone

will provide

year-round comfort and efficiency.

Designed for durability, comfort,

and reliability, the model 58MVP

WeatherMaker Infinity is the ultimate

in versatile, efficient comfort.

58MVP FEATURES/BENEFITS

Comfort Heat Technology — On the

coldest days of the year, the 58MVP

Furnace has the capacity to heat your

home. On moderate days when less

heat is required, this furnace will

regulate itself to a lower capacity —

providing a comfortable home and

minimizing operating costs.

Media Filter Cabinet — Enhanced

indoor air quality in your home is made

easier with our media filter cabinet—a

standard accessory on all deluxe

furnaces. When installed as a part of

your system, this cabinet allows for

easy and convenient addition of a

Carrier high-efficiency air filter.

Insulated Blower Compartment —

The acoustical insulation reduces air

and motor noise for quiet operation.

Certifications — The 58MVP units

are A.G.A. and C.G.A. design certified

for use with natural and propane gases.

The furnace is factory-shipped for use

with natural gas. An A.G.A./C.G.A.

listed gas conversion kit is required to

convert furnace for use with propane

gas. The efficiency is GAMA

efficiency rating certified. The 58MVP

meets California Air Quality

Management District emission

requirements.

*See warranty information for details.

HEAT EXCHANGERS

2

Quality Registration — The 58MVP

is engineered and manufactured under

an ISO 9001 registered quality system.

Venting — The combustion-air and

vent pipes can terminate through a side

wall or through the roof when used

with a factory-authorized vent

termination kit.

Blower Access Panel Switch —

Automatically shuts off 115-v power

to furnace whenever blower access

panel is opened.

Reliable Heat Exchanger Design —

The primary heat exchanger is made of

aluminized steel for corrosion resistance.

The patented Serpentuff

heat exchanger cells are laminated

with polypropylene for greater

resistance to corrosion and epoxy

coated externally to prevent oxidation.

This break-through in heating

technology helps extend the life of the

furnace for years of dependable

performance. The heat exchanger is

positioned in the furnace to extract

additional heat.

Warranty — The 58MVP heat

exchangers come with a Limited

Warranty for lifetime of original

owner in single family residence;

20 years in other residential and

commercial applications. Contact

your dealer for details.

Electronic Variable-Speed Motors

— ICM Motors (Integrated Control

and Motor) provide variable-speed

operation to optimize comfort levels in

the home year round. They are also

more economical to operate than

standard motors. Motor and electronic

controls are guaranteed by a 5-year

Limited Warranty.

Comfort Heat Control Center —

The microprocessor control center

features state-of-the-art combustion,

temperature, and airflow control to

maximize comfort while operating at

peak efficiency.

Combustion control is obtained by taking

A92505

CONTROL CENTER

the appropriate inducer motor RPM

readings when the low- and high-fire

pressure switches are made. Using this

information, the microprocessor

maintains a consistent air-to-fuel ratio

independent of vent sizing and conditions.

The first cycle after power reset

provides 16 minutes of low heat

before switching to high heat unless

the room thermostat has been satisfied.

Subsequent thermostat cycles provide

anywhere from 0 to 16 minutes of low

heat depending on the length of the

previous thermostat cycle.

Airflow control is accomplished by

using a technique involving the

TM

microprocessor and blower motor. The

condensing

static load on the air delivery system is

measured each heating cycle. The

microprocessor then uses this

information to deliver correct airflow

independent of variations in system

restrictions. (For example, dirty filter or

zone damper changes during a cycle.)

A special dehumidification function

allows direct input from a Thermidistat

or humidistat. This input adjusts

system airflow for greater humidity

removal and increased cooling comfort

during summer months.

Insulation — Foil-faced insulation in

heat exchanger section of the casing

minimizes heat loss.

Direct Vent Sealed Combustion

System — Model 58MVP uses 100

percent outdoor air, which results in

especially quiet operation. Direct

venting minimizes the possibility of

using contaminated air and also reduces

air infiltration draftiness in the home.

Monoport Burners — The burners

are finely tuned for smooth, quiet

combustion and economical operation.

Bottom Closure — Factory-installed

for side return; easily removable for

bottom return.

HUM

G

R

Y/Y2

W/W1

COM

W2

3

O

1 2 3

O

1 2 3

N

N

ON

1 2 3 4 5 6 7 8

A95168

INDUCER ASSEMBLY

A93005

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Fault Code 42

INDUCER OUTSIDE VALID SPEED RANGE—This fault indicates that inducer motor is not operating at

calculated RPM or has not started within 10 sec after a call for heat.

STEP

Turn power off, remove blower access panel, and disconnect all thermostat leads from furnace con-

1.

trol board.

2.

Turn power on and depress door switch. Use a piece of tape to hold switch closed.

3.

Jumper R and W/W1 thermostat terminals on furnace control board.

4.

Observe operation of furnace for next 8 minutes or until fault occurs.

5.

Does fault occur again?

6.

Does a different fault occur?

7.

Go to page number indicated in Index for fault code flashed.

8.

Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS.

9.

Does fault occur within 11 sec after a call for heat?

10.

Do you have 120v between I1 and I2 on furnace control board?

11.

Do you have 120v between terminals PL7-6 and PL7-12?

You have an open wire or bad terminal on either the BLACK or WHITE wire between furnace con-

12.

trol board and inducer motor MTR1.

13.

Are all pins and wire leads intact on connectors between furnace control board and inducer motor?

14.

Fix problem.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals. Turn power

15.

on and wait a few sec for self test before proceeding to next step.

16.

Put setup switch SW-4 for EMER. HEAT in ON position.

17.

Jumper R and W/W1 thermostat terminals on furnace control board.

18.

Does inducer motor turn on?

19.

Does inducer wheel rub against inducer housing?

20.

Turn power off.

21.

Does inducer wheel turn freely?

22.

Replace inducer motor or inducer motor assembly.

23.

Replace furnace control board.

Disconnect jumper wire across R and W/W1 thermostat terminals and put setup switch SW-4 for

24.

EMER. HEAT in OFF position.

25.

Turn power on and wait a few sec for self test before proceeding to next step.

Check 12-vdc line. To do this, connect a DC voltmeter across terminals PL1-6 BROWN (+) and

26.

PL1-7 GREEN (-). Is voltage across BROWN and GREEN wires 11.5 — 12.5 vdc?

27.

Turn power off.

28.

Do you have continuity between PL7-2 and PL1-6?

29.

You have an open wire or bad terminal on BROWN wire between connectors PL7 and PL1.

Disconnect jumper wire across R and W/W1 thermostat terminals and put setup switch SW-4 for

30.

EMER. HEAT in OFF position.

Check RPM feedback line. To do this, connect a DC voltmeter across terminals PL1-6 BROWN (+)

and PL1-5 ORANGE (-), then put setup switch SW-6 for COMPONENT TEST in ON position. Does

voltage across BROWN and ORANGE wires change between states as shown below?

31.

• State 1—OFF (11.5 — 12.5 vdc)

• State 2—LOW (10.2 — 11.2 vdc)

• State 3—HIGH (8.4 — 9.4 vdc)

32.

Turn power off.

33.

Do you have continuity between PL7-1 and PL1-5?

34.

You have an open wire or bad terminal on ORANGE wire between connectors PL7 and PL1.

Does fault occur a few sec after low-pressure switch LPS makes?

35.

NOTE: Check for 24v between the N.O. (Normally Open) contact on low-pressure switch LPS

and Com on furnace control board to know when low-pressure switch LPS makes.

36.

Is inducer motor rotating in direction shown on inducer housing?

37.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals.

Connect 1 side of a slope manometer with a tee to collector box pressure tap. Connect other side

38.

with a tee to gas valve air pressure fitting. Refer to pressure check diagram in Appendix C.

Turn power on and wait several sec, then jumper R and W/W1 thermostat leads on furnace control

39.

board.

Do you have more than 1.0 in. wc pressure drop (0.80 in. wc on trophy unit) across heat exchang-

ers when low-pressure switch LPS makes?

40.

NOTE: Check for 24v between the N.O. (Normally Open) contact on low-pressure switch LPS

and Com on furnace control board to know when low-pressure switch LPS makes.

41.

Turn power off.

42.

Is inducer blower wheel okay?

ACTION

29

YES

NO

GO TO

2

3

4

5

9

6

7

60

INDEX

INDEX

52

35

11

14

13

12

14

15

14

8

16

17

18

30

19

14

20

21

24

22

8

8

25

26

27

23

28

22

29

14

31

23

32

33

22

34

14

36

48

37

22

38

39

40

47

41

42

44

43

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How to Replace a draft inducer fan motor on a Carrier / Bryant Furnace - 58PAV Model

Thread: Repair or replace 15 yr. old 58MVP Carrier?

Hi, this is my 1st. post - I was directed to this site from a friend.
Later today I have an appt. with my local contractor to go over my options / pricing ect...
I have a 58MVP80 Carrier Serial # 2996A00720 that needs a new inducer motor assembly and the technician that was on the service call for that initial problem (Noise) said that the secondary heat exchanger looked to be corroded and will need to be changed out also. He did not run the furnace, he just did a visual through a small 1 1/2" X 2" hole.
When I made the appt. for today, they mentioned a rebate for the secondary heat exchanger but didnt go into details.
This is a 15 year old furnace that has worked very well.
I have Central air (Carrier / installed at the same time of this furnace).
I also have a very nice pleated air filter on this Carrier furnace, which I'm not sure is factory or an extra item, as I'm the 2nd. owner of this house and dont know what was stock and what was extra.
So my question is - Repair or replace?
f I replace - yes cost is an object - I would like to go with another Carrier - probably the Infinity 96 - pretty much like what I have now.
Any suggestions?
Thank you all for your time - chillywilly28 in Michigan

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Motor carrier 58mvp inducer

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