Bradford-White Corp MI403S Manual De Usuario

5

Pilot Will Not Light

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.
5. Pilot electrode not sparking to pilot.
6. Piezo igniter not functioning.

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.
7 Resettable thermal switch has opened.

Pilot Will Not

stay lit

when button is 

released

Pilot will light but 

the main burner 

will not come on

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.

Pilot goes out 

periodically (after 

heating cycles, 

once a day, once 

a week etc.)

1. Insufficient combustion air supply.

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

3. Inconsistent gas supply or gas pressure.

Not enough hot 

water

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.

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.
5. Verify correct electrode position. Replace
    pilot assembly.
6. Replace Piezo igniter. 

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.
7. Determine cause of switch activation. To
    reset, depress button on resettable thermal
    switch located on inner door. 

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. Inspect flame arrestor
    plate and clean with stiff bristled brush
    and/or vacuum to remove any debris
    accumulation.
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.

1. See Service Procedure
    RG-V, Page 12.

4. See Service Procedure
    RG-III, Page 10.

5. See Service Procedure
    RG-III, Page 10.

6. See Service Procedure
    RG-IV, Page 11.

4. See Service Procedure
    RG-II, Page 8

5. See Service Procedure
    RG-V, Page 14

6. See Service Procedure
    RG-V, Page 13

2. See Installation &
    operation manual.

3. See Service Procedure
    RG-V, Page 12

4. See Service Procedure
    RG-V, Page 12

1. See Service Procedure
    RG-VIII, Page 22

3. See Service Procedure
    RG-V, Page 12

5. See Service Procedure
    RG-V, Page 12

6. See Service Procedure
    RG-IX, Page 23

Flammable Vapor Ignition Resistant Water Heaters