Bradford-White Corp M1XR65T*(BN, MI75S*(BN, GX155S*BN, GX225S*BN, MI100T*(BN Troubleshooting Chart

Troubleshooting Chart

SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION

SERVICE

PROCEDURE

Pilot will not light

Pilot will not

stay lit

when button is

released

1.No incoming gas or too low gas pressure.

2.Gas control knob set to wrong position.

3.Pilot light button not being fully depressed when attempting to light pilot.

4.Pilot orifice or pilot tube is obstructed or kinked.

1.Poor thermocouple connection at combination thermostat/gas valve.

2.Thermocouple not fully engaged in pilot assembly bracket.

3.Pilot flame is not fully enveloping the thermocouple “hot” junction.

4.Weak or defective thermocouple.

5.Open ECO on combination thermostat/ gas valve.

6.Defective magnet in combination thermostat/gas valve.

1.Turn on gas supply and/or check line pressure.

2.Review lighting instruction. Set combination/thermostat

gas valve to correct position.

3.Review lighting instruction. Fully depress pilot lighting button.

4.Clean, repair or replace.

1.Check connection at combination thermostat/gas valve. Proper tightness should be finger tight plus ¼ turn.

2.Inspect thermocouple to ensure that it is fully engaged into pilot bracket.

3.Adjust tip of thermocouple to be fully engulfed by pilot flame.

4.Check thermocouple and replace if necessary.

5.Check ECO continuity and replace combination thermostat/gas valve if necessary.

6.Check magnet operation and replace combination thermostat/gas valve if necessary.

1.See Service Procedure AG-III, Page 6.

4.See Service Procedure AG-II, Page 5.

4.See Service Procedure AG-I, Page 4

5.See Service Procedure AG-III, Page 6

6.See Service Procedure AG-III, Page 6

Pilot will light, but the main burner will not come on

Pilot goes out

periodically (after

heating cycles,

once a day, once

a week etc.)

Not enough hot

water

1.Combination thermostat/gas valve set too low for desired water temperature.

2.Combination thermostat/gas valve temperature is satisfied.

3.Insufficient gas supply or low gas pressure.

4.Combination thermostat/gas valve has wide differential or is out of calibration.

1.Insufficient combustion air supply.

2.Incorrect, clogged vent system/ vent terminal or location.

3.Inconsistent gas supply or gas pressure.

1.Combination thermostat/gas valve set too low for desired water temperature.

2.Cold inlet water temperature is very cold.

3.High demand periods.

4.Incorrectly sized water heater for application.

5.Combination thermostat/gas valve is out of calibration/not functioning.

6.Out of spec dip tube is diluting hot water with cold water.

7.Integrated mixing device is set too low for desired water temperature.

1.Adjust temperature dial on combination thermostat/gas valve.

2.Check temperature dial setting on combination thermostat/gas valve.

3.Check gas supply and line pressure.

4.Check combination thermostat/gas valve for proper operation, replace if necessary.

1.Verify adequate combustion air is available to the unit. Check and clear Jacket slot openings of any dirt, dust, restrictions or other obstructions.

2.Check venting for proper sizing and proper operation

3.Check gas supply and line pressure.

1.Check dial on combination thermostat/gas valve.

2.Extremely cold water going into the heater will decrease the amount of hot water produced. It may be necessary to temper incoming water supply.

3.Adjust high demand usage.

4.Contact Plumbing professional.

5.Check combination thermostat/gas valve for proper operation, replace if necessary.

6.Inspect dip tube and replace if necessary.

7.Reset device using the procedure

in the instructions included with the device.

2.See Installation & operation manual.

3.See Service Procedure AG-III, Page 6

4.See Service Procedure AG-III, Page 6

3.See Service Procedure AG-III, Page 6

5.See Service Procedure AG-III, Page 6

6.See Service Procedure AG-V, Page 13

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