- 28 -
- 29 -
Fault findings
PCB
2
3
4
6
1
10
8
9
5
PCB
2
6
10
8
9
5
PCB
2
6
10
8
9
5
< Fig. 1>
Continuity of Fuse
< Fig. 2>
Water Flow Sensor
< Fig. 3>
Voltage of
Ignitor Transformer
< Fig. 5>
Voltage or Resistance of Gas Valve Assembly
< Fig. 7>
Continuity of Over Heat
Thermostat
< Fig. 8>
Resistance of
Temperature Sensor
< Fig. 9>
Continuity of water level electrode
After pulling out connector No.4
on PCB,connect two pins of the
bottom with flat blade screwdriver
directly.
5A
OR
Voltage
Resistance
Temperature Sensor
See
Table 3
4
unused pin
Connect directly pulling
out connector
Connect
directly
0
BL
O
Y
Y(C)
BL
G
Y(C)
Y
O
G
8
8
Pull out
Measure registance with
pulling out connector
Measure voltage without
pulling out connector
See
Table 1
PCB
2
3
4
6
1
10
8
9
5
< Fig. 6>
Voltage of Gas Control
Valve
Y(C)-G
Y(C)-O
Y(C)-BL
Y(C)-Y
ALL
DC12V
< Fig. 4>
Continuity of
Thermal Fuse
Thermal fuse
0
Over Heat Thermostat
0
9
Measure voltage without
pulling out connector
BK
BK
AC240V
4
GR
GR
DC1.8
-
16.2V
Measure voltage without
pulling out connector
Measure after removing
the connector
Infinite
Neutralizer
< Table 1 >
Resistance of Gas Valve Assembly
Lead wire
Resistance (Ω)
Yellow(C)-Orange Gas valve 1
Approx. 33
Yellow(C)-Blue Gas valve 2
Approx. 33
Yellow(C)-Green Gas valve 3
Approx. 33
Yellow(C)-Yellow Main gas valve
Approx. 26
Grey-Grey Gas control valve
Approx. 65
< Table 3 >
Resistance of Temperaturer Sensor
Temperature
(°C)
Resistance (kΩ)
(Incoming,Outgoing)
Resistance (kΩ)
(Ambient)
10
Approx. 15.8
Approx. 20.5
20
Approx. 10.4
Approx. 12.6
35
Approx. 5.9
Approx. 8.0
40
Approx. 4.9
Approx. 5.2
50
Approx. 3.5
Approx. 3.5
< Table 2 >
Gas Pressure (kPa)
Gas type
Gas supply
pressure
Manifold pressure
Maximum Minimum
Propane
2.75-7.0
1.20
0.210
Natural Gas
1.13-5.0
0.84
0.160
Abbr. of color :
Y
: Yellow
R
: Red
G
: Green
O
: Orange
BK
: Black
GR
: Grey
BL
: Blue
W
: White
