Bradford-White Corp MI30T*F SERVICE PROCEDURE RG-VI Gas Control Testing, Disassembly & Replacement (Honeywell), TEMPERATURE SENSOR TESTING, CAUTION

SERVICE PROCEDURE RG-VI
Gas Control
Testing, Disassembly & Replacement (Honeywell)
The Bradford White
DEFENDER
Safety System®
TEMPERATURE SENSOR TESTING
Temperature Sensor Tes ting
Following “GasControl
Disassembly/Reassembly”
instructions, disassembleGas
Control to access tempe rature
sensor.
N
Y
Using a multi-meter set to the oh ms setting, insert one mete r 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 on left).
Alternate the probe on the outside position to the opposite outside wire position
(see photo on right).
Replace temperature
sensor
Withthe temperature sensor still
in theback plate, use a multi-
meter set to the Ohms setting,
determine the resistance of
temperature sensor
(see caution and photos above)
Replace GasControl
Once thetemperaturesensor resistance valuesare known, the
water temperature must alsobe knownto determine if the
resistancevalues are correct. See next page to obtainwater
temperature.
Are temperature sensor resistancevalues correct?
CAUTION
DO NOT use standard multimeter probes for this test.
Doing so will damage connector. Use special pin type
electronic probes or small diameter wire pins i nserted
into connector.
IfControl has gone into lockout dueto excessive
tank temperature (four flash, thr ee second pause)
reset control by rotating gas control knob to “OFF”
position and wait aminimum of (5) minutes. Then
follow lighting instructi ons and return gas c ontrol
knob to desired setpoint .
Observe Green LED indicator.
Does error code 4 (four flash, three
second pause) continue?
Resume normaloperation.
Y
N
22
22
22