Bradford White IGI-180R-10 Service Manual page 32

VI - TROUBLESHOOTING
Troubleshooting Flow Chart
BEFORE CARRYING OUT CHECKS MARKED WITH
A # SIGN, DISCONNECT THE POWER SUPPLY.
Examination
Nature of Fault Point
7. Check remotes (s)
(where connected.)
B. Digital monitor 1. Check water flow
lights up, but sensor.
combustion does
not commence.
(when remotes
are connected).
Error code "72" 2. Check flame rod
displayed on the
digital monitor.
Error code "32" 3. Check outgoing
displayed on the water temperature
digital monitor. thermistor.
Error code "61" 4. Check
displayed on the combustion fan.
digital monitor.
(cont.)
Diagnostic Point
2. Measure the voltage Are values within
at connector F with those specified at
appliance power supply left.
on.
F – Black ~ White
100 ~ 120 VAC
F – Blue ~ Brown
7
100 ~ 120 VAC
Measure voltage 11 ~ 13 VDC Digital
between remote control
terminals at D.
1. Measure voltage 11 ~ 13 VDC
between red ~ black of
connector B .
4
(See page 37)
2. Measure voltage
4 ~ 7 VDC
between yellow ~ black
at connector B .
4
(See page 37)
# Measure resistance Resistance > 1MΩ?
between flame rod
terminal C and earth.
1
(See page 38)
# Disconnect connector Are values as shown
B5 and measure
at left?
resistance.
Open circuit: > 1MΩ
Short circuit: < 1Ω
(See page 38)
1. Check motor. 6 ~ 45 VDC (Fan on)
Measure voltage 0 VDC (Fan off)
between black ~ red at
connector A .
1
(See page 39)
2. Check fan rotation 11 ~ 13 VDC
sensor. Measure voltage
between black ~ yellow
at connector A .
1
(See page 39)
3. Measure voltage 6 ~ 45 VDC
between black ~ white
of connector A .
1
(See page 39)
32
Values Y/N
Yes Go to A – (7)
No Replace
transformer
Yes Check cable
for shorts or
broken wires.
Replace
remote
control.
No Replace PCB.
Yes Go to B–1-2
No Replace PCB.
Yes Go to B - 2
No Replace water
flow sensor.
Yes Replace PCB
No Replace flame
rod
Yes Replace water
temperature
thermistor.
No Go to B - 4
Yes Go to B – 5-2
No Replace PCB
Yes Go to B – 4-3
No Replace PCB
Yes Go to B – 5
No Replace fan
Service
Action Procedure
IGI – 7
IGI – 2
IGI – 2
IGI – 3
IGI – 2
IGI – 6
IGI – 2
IGI – 2
IGI – 5