Bradford White MI30T*F(BN,CX,SX) Service Manual page 5

National Excelsior Company
www.excelsiorhvac.com
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
None (LED not on
or flashing
One flash and
three second
pause
LED on
continuously
(Solid)
Two flashes and
three second
pause
Three flashes and
three second
pause
Four flashes and
three second
pause
Honeywell Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water Heaters
Control Status
Gas Control is operating normally.
Pilot flame may not be present.
Check for pilot flame through sight
glass and light if necessary.
If set point knob is in "PILOT"
position then pilot flame is
detected. Turn set point knob to
desired setting.
Set point knob has been recently
turned to the "OFF" position. Wait
until LED goes out before
attempting to relight
Weak pilot signal detected. System
will reset when pilot flame is
sufficient.
Insufficient water heating. System
will reset.
Excessive tank temperature.
System must be reset.
Subject to change without notice.
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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