Bradford White Everhot IGI-180C-5N, Руководство по обслуживанию

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