Result
Cause
Remedy
1
A. When the plug is put into an outlet.
0Ω
Failure of transformer
Replace transformer
0Ω
0Ω
Failure of pre-heater
Replace pre-heater
B. When the switch is turned on.
Failure of fan motor
Replace fan motor
0Ω
C.
Failure of igniter
Replace of igniter
D.
Failure of fuel pump
Replace of fuel pump
0Ω
E.
Failure of solenoid valve
Replace of solenoid valve
0Ω
When fuse blows out about 17
seconds after turning on.
※When igniter is operated.
※When fuel pump is operated.
※When solenoid valve is operated.
Replace burner controller
Standard: white-white：about 110Ω ⇒ Figure 3
(P.17)
yellow-yellow：about 20Ω
Failure of burner controller
Replace burner controller
Unplug pre-heater connector, then measure coil
resistance values
Surge absorber is short-
curcuited.
Standard: black-black(Thick)：
about 4kΩ ⇒ Figure 3
(P.17)
Unplug fan motor connector (CN 3) from burner
controller, then measure resistance values
Fuse does not blow out
Unplug solenoid valve connector (CN 6) from burner
controller, then measure resistance values
Unplug igniter connector(CN 4) from electrode、then
measure coil resistance values of the high voltage side
Fuse does not blow out
standard red-red：about 1.8kΩ ⇒ Figure 3(P.17)
Unplug fuel pump connector(CN 5) from burner
controller, then turn on
How to check
Unplug igniter connector(CN 4) from burner controller,
then turn on
0Ω
Fuse blows out.
Unplug fan motor connector (CN 3) from burner
controller, then turn on
※When fan moter is operated.
Standard: other than 0Ω ⇒ Figure 5 (P.18)
Standard: red-blue：about 520kΩ ⇒ Figure 3 (P.17)
Disconnect all connectors from the burner controller,
then plug the power cable into an outlet
red-red：about 3Ω
Fuse does not blow out
Fuse does not blow out
Unplug transformer connector (CN 2) from burner controller,
then measure coil resistance values
Phenomenon
When fuse blows out about 15
seconds after turning on.
Fuse blows out
Measure resistance at surge absorber (SA1)
When fuse blows out about 22
seconds after turning on.
Unplug solenoid valve connector(CN 6) from burner
controller, then turn on
Unplug fuel pump connector (CN 5) from burner
controller, then measure resistance values
standard: blue-blue：about 88Ω ⇒ Figure 3 (P.17)
Standard: white-blue：about 400Ω ⇒ Figure 3 (P.17)
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