Fault Code 31

HIGH-PRESSURE SWITCH FAULTÐThis fault can occur under the scenarios shown below, keep in mind that whenever furnace control board shuts unit down, gas shuts off immediately, inducer continues running for 15 sec, and if blower is running, it remains running at low-heat speed or reduces to low-heat speed for selected off delay.

·CALL FOR HEATÐIf high-pressure switch HPS is made when a call for heat is initiated, furnace control board flashes Fault Code 31 until switch opens, then cycle begins.

·LOW HEAT

1.PREPURGE AND FIRST 45 SEC AFTER IGNITIONÐIf high-pressure switch HPS makes during prepurge or just after ignition, furnace control board continues operating until burners are lit and inducer RPM is within 10% of calculated low-fire RPM. If high-pressure switch HPS remains made, furnace control board starts flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

2.STEADY-STATEÐIf high-pressure switch HPS makes during low heat, furnace control board starts flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

·HIGH HEAT

1.PREPURGEÐIf high-pressure switch HPS does not make within 45 sec after low-pressure switch LPS makes, furnace control board starts flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

If high-pressure switch HPS opens before ignition, furnace control board starts flashing Fault Code 31 and ramps inducer RPM up until high-pressure switch HPS remakes. When high-pressure switch HPS remakes, furnace control board stops flashing Fault Code 31 and continues heating cycle. If high-pressure switch HPS does not remake within 45 sec after opening, furnace control board continues flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

2.FIRST MINUTE AFTER IGNITIONÐIf high-pressure switch HPS opens during first minute after ignition, furnace control board starts flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

3.STEADY-STATEÐIf high-pressure switch HPS opens during high heat, furnace control board starts flashing Fault Code 31 and ramps inducer RPM up until high-pressure switch HPS remakes. When high-pressure switch HPS remakes, furnace control board stops flashing Fault Code 31 and continues heating cycle. If high-pressure switch HPS does not remake within 45 sec after opening, furnace control board continues flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

4.HIGH FIRE TO LOW FIRE TRANSITIONÐWhen using a 2-stage thermostat and W2 is de-energized, high-pressure switch HPS must open within 45 sec. If high-pressure switch HPS does not open within 45 sec after W2 was de-energized, furnace control board starts flashing Fault Code 31, shuts unit down, waits 2 minutes, stops flashing Fault Code 31, and restarts heating cycle.

STEP

ACTION

YES

NO

GO TO

1.

Turn power off, remove blower access panel, and disconnect R thermostat lead.

Ð

Ð

2

2.

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

Ð

Ð

3

3.

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

Ð

Ð

4

4.

Observe operation of furnace through 1 heating cycle.

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.

Does fault occur within 5 sec after W/W1 is energized?

10

18

Ð

10.

Do you have 24v between the N.O. (Normally Open) contact on high-pressure switch HPS and Com

12

15

Ð

on furnace control board?

 

 

 

 

11.

Replace furnace control board.

Ð

Ð

8

12.

Is high-pressure switch HPS wired correctly?

14

13

Ð

13.

Rewire high-pressure switch HPS per wiring diagram.

Ð

Ð

8

14.

Replace pressure switch assembly.

Ð

Ð

8

15.

Do you have 24v between connector terminal PL2-4 and Com on furnace control board?

16

11

Ð

16.

The main harness is miswired.

Ð

Ð

17

17.

Fix problem.

Ð

Ð

8

18.

Does fault occur during blower on delay period?

19

23

 

19.

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

Ð

Ð

20

20.

Turn power on and wait several sec, then jumper R, W/W1, and W2 thermostat terminals on fur-

Ð

Ð

21

nace control board.

 

 

 

 

21.

Does Fault Code 14 start flashing when high-pressure switch HPS makes?

22

14

Ð

22.

The BLUE and GREEN wires to gas valve GV are reversed.

Ð

Ð

17

23.

Does fault occur during low fire after blower turns on?

24

29

Ð

24.

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

Ð

Ð

25

21

Page 21
Image 21
Carrier 58MVP instruction manual · LOW Heat

58MVP specifications

The Carrier 58MVP is a high-efficiency gas furnace designed for optimal performance and energy savings. This model represents Carrier's commitment to innovative engineering and advanced technology, making it a preferred choice for homeowners seeking reliable heating solutions.

One of the standout features of the 58MVP is its impressive Annual Fuel Utilization Efficiency (AFUE) rating, which can reach up to 96 percent. This high AFUE rating indicates that the furnace uses less energy to produce heat, leading to lower utility bills and a reduced carbon footprint. The furnace is equipped with a two-stage gas valve that allows it to operate on a low setting during mild weather, providing increased efficiency and comfort.

The 58MVP also features Carrier's Infinity Control system, an advanced programmable thermostat that enables homeowners to customize their heating preferences. This system allows for precise temperature control and scheduling, ensuring that the home remains at a comfortable temperature while minimizing energy consumption.

In addition to its efficiency, the 58MVP is designed with noise reduction technology, including a quiet operating blower and insulated cabinet. This reduces operational sound, allowing for a more peaceful home environment. The model's multi-speed blower motor enhances comfort by providing consistent airflow and further optimizing efficiency.

Durability is a key characteristic of the Carrier 58MVP. It has a stainless-steel heat exchanger that promotes longevity and performance. The furnace is also equipped with a galvanized steel cabinet featuring a powder-coated finish, which protects against rust and corrosion.

The 58MVP is compatible with Carrier's advanced air purification systems, optimizing indoor air quality while heating. With features designed for efficiency, comfort, and durability, the Carrier 58MVP is an exceptional choice for homeowners looking to enhance their heating systems. The combination of advanced technologies, such as the two-stage operation and Infinity Control, positions this furnace as a leader in the market, meeting the needs of today's energy-conscious consumers. Ideal for both new constructions and retrofits, the Carrier 58MVP continues to set the standard for residential heating solutions.