Bradford White MI30T Service Manual page 5

Honeywell Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water Heaters
Observe green LED indicator on
Gas Control. Error flash codes are
displayed with a three second pause
before repeating. Check and repair
the system as noted in the
troubleshooting table below.
LED Status
Gas Control is operating normally.
None (LED not on
Pilot flame may not be present.
or flashing Check for pilot flame through sight
glass and light if necessary.
If set point knob is in "PILOT"
One flash and
position then pilot flame is
three second
detected. Turn set point knob to
pause
desired setting.
Set point knob has been recently
LED on
turned to the "OFF" position. Wait
continuously
until LED goes out before
(Solid)
attempting to relight
Two flashes and
Weak pilot signal detected. System
three second
will reset when pilot flame is
sufficient.
pause
Three flashes and
Insufficient water heating. System
three second
will reset.
pause
Four flashes and
Excessive tank temperature.
three second
System must be reset.
pause
Control Status Probable Cause
1. Gas Control is functioning
normally.
2. Gas Control is not powered. Light
pilot.
3. Thermopile failure.
Gas Control is powered and waiting
for the set point knob to be turned to
a water temperature setting.
Set point knob was turned to "OFF"
position.
1. Thermopile failure
2. Unstable pilot
3. Pilot tube block or restricted.
4. Resettable thermal switch has
opened
1. Temperature sensor out of
calibration
1. Temperature sensor out of
calibration
2. Faulty Gas Control
5
Green LED Indicator
Service
Procedure
If the pilot will not stay
lit replace pilot
assembly. If problem
persists replace Gas
Control.
Normal operation.
Adjust thermostat to
desired temperature
setting.
LED will go out and the
control will function
normally when the pilot
is lit.
1. See service
procedure RG-II
2. See service
procedure RG-III
3. See service
procedure RG-III
4. See service
procedure RG-VIII
1. See service
procedure RG-VI
1. See service
procedure RG-VI
2. See service
procedure RG-VI
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