Bradford White RG130T*N Series Service Manual page 23

SERVICE PROCEDURE RG-VI
Gas Control Testing, Disassembly &
Replacement (Honeywell)
TEMPERATURE SENSOR TESTING
If control has gone into lockout due to excessive
tank temperature (four flashes, three second
pause) reset control by rotating gas control knob
to "OFF" position and wait a minimum of (5)
minutes. Then follow lighting instructions and
return gas control knob to desired setpoint.
Observe Green LED indicator.
Does status code 4 (four
flashes, three second pause)
Y
Temperature Sensor Testing
Following "Gas Control
Disassembly/Reassembly"
instructions, disassemble gas
control to access temperature
sensor.
With the temperature sensor, still
in the back plate, use a multi-
meter set to the Ohms setting,
determine the resistance of
temperature sensor
(see caution and photos above)
Once the temperature sensor resistance values are known, the
resistance values are correct. See next page to obtain water
temperature.
Are temperature sensor resistance values correcting?
Replace gas control
N
Using a multi-meter set to the ohms setting, insert one-meter probe (see
caution) into center wire position of thermal well connector, insert the
second probe (see caution) into either of the outside wire positions (see
photo above).
Alternate the probe on the outside position to the opposite outside wire
position
(see photo above).
Resume normal operation.
Y
SERVICE PROCEDURE RG-VI
Gas Control Testing, Disassembly &
Replacement (Honeywell)
TEMPERATURE SENSOR TESTING
CAUTION
DO NOT use standard multimeter probes for this test.
Doing so will damage connector. Use special pin type
If control has gone into lockout due to excessive
electronic probes or small diameter wire pins inserted
tank temperature (four flashes, three second
into connector. pause) reset control by rotating gas control knob
to "OFF" position and wait a minimum of (5)
minutes. Then follow lighting instructions and
return gas control knob to desired setpoint.
Observe Green LED indicator.
Does status code 4 (four
flashes, three second pause)
Temperature Sensor Testing
Following "Gas Control
Disassembly/Reassembly"
instructions, disassemble gas
control to access temperature
sensor.
With the temperature sensor, still
in the back plate, use a multi-
meter set to the Ohms setting,
determine the resistance of
temperature sensor
(see caution and photos above)
Once the temperature sensor resistance values are known, the
N
Replace temperature resistance values are correct. See next page to obtain water
sensor
Are temperature sensor resistance values correcting?
N
Using a multi-meter
Y
caution) into center
second probe (see
photo above).
Alternate the probe
position
(see photo above).
Resume normal operatio
temperature.
Y
Replace gas control
23
DO
Doin
elec
into
N
23