Bradford White IGI-180R-10 Service Manual page 33

VI - TROUBLESHOOTING
Troubleshooting Flow Chart
BEFORE CARRYING OUT CHECKS MARKED WITH
A # SIGN, DISCONNECT THE POWER SUPPLY.
Examination
Nature of Fault Point
Error code "11" 5. Check ignition
displayed on module.
digital monitor.
6. Check main gas
solenoid valve (SV0)
Error code 71
7. Check solenoid
valve (SV1)
8. Check
changeover solenoid
valve (SV2)
Error code "14" 9. Check thermal
displayed on fuse
digital monitor
10. Check overheat
(remaining flame) bi-
metal switch
(cont.)
Diagnostic Point
1. Measure voltage 90 ~ 110 VAC
between grey ~ grey of
connector F (sparker).
8
(See page 39)
2. # Remove connector
Is resistance >
F and measure the
1MΩ?
8
resistance between
sparker and terminals.
(See page 39)
3. Check if unit is Is the ignition
sparking. module sparking?
1. # Disconnect the main 1.7 ~ 2.1KΩ
solenoid valve connector
E from the PCB, and
measure the resistance
between pink ~ black
(SV0)
2. Measure voltage
80 ~ 100 VDC
between pink ~ black of
SV0 connector.
(See page 40)
1. # Disconnect 1.7 ~ 2.1KΩ
connector E from the
PCB. Measure resistance
between yellow ~ black
of (SV1).
2. Measure voltage
80 ~ 100 VDC
between yellow ~ black
of SV1 connector.
(See page 40)
1. # Disconnect 1.7 ~ 2.1KΩ
connector E from the
PCB. And measure
resistance between blue
~ black (SV2)
2. Measure the voltage
80 ~ 100 VDC
between blue ~ black or
SV2 connector.
(See page 40)
1. # Disconnect Is resistance < 1Ω?
connector B and C
3 3
measure resistance
between red ~ red.
2. # Disconnect OHS
Is resistance < 1Ω?
(remaining flame) bi-
metal switch festoon
terminal B and C , and
3 3
measure resistance
between terminal on
switch. (See page 42)
33
Values Y/N
Yes Go to B-5-2
No Replace PCB
Go to B-5-3
Yes
Adjust/
No
Replace
ignition
module
Yes Go to B-6
No Adjust/
Replace
electrode
Yes Go to B-6-2
No Replace gas
valve
Yes Go to B-7
No Replace PCB
Yes Go to B-7-2
No Replace gas
valve
Yes Go to B-8
No Replace PCB
Yes Go to B-8-2
No Replace gas
valve
Yes Go to B-9
No Replace PCB
Yes Go to B-10
Replace
No
thermal fuse
Replace PCB
Yes
Replace
No
remaining
flame bi-metal
switch
Service
Action Procedure
IG2 – 2
IGI – 4
IGI – 9
IGI – 2
IGI – 9
IGI – 2
IGI – 9
IGI – 2
IGI – 11
IGI – 2