Shizuoka Seiki VAL6 EPX Series, Maintenance Manual

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PAGE 14
VAL6 EPX Trouble Shooting
No. Possible Cause How to check Result Remedy
37 Replace a burner control
Electrode is defective Replace an electrode
（
abnormal electrode
）
Confirm that an electrode or
a high-voltage cord are not
wet or dirty by grime Clean an electrode or a
high-voltage cord
(clearance is out of
alignment) Refer to drawing
①
(See
diagram blow)
Plug in connector (CN12)
firmly If it works normally, ignition
transformer connector
(CN12) fails on contact Plug in ignition transformer
connector (CN12) again,
and then turn on the
operation switch Ignition transformer
connector (CN12) is
loose connection
The heater does not ignite
Fuel pump doesn't turn on (no vibration of the fuel pump)
42
If it shows AC 0V, burner
control is defective Burner control is
defective
39
40
If it shows ∞Ω, the
ignition transformer is
defective
41
Electrode is not sparking
Measure voltage at
terminal for ignition
transformer (CN12) on
burner control
Standard: EPX1 AC230V
EPX5 AC120V
Replace a burner control
Ignition transformer is
defective / Ignition
transformer cord is
disconnection If it shows AC 230V/120V,
fan motor is defective Replace an ignition
transformer
If it works normally, fuel
pump connector fails on
contact Plug fuel pump connector
(CN14) again, and then turn
on the operation switch
Fuel pump is defective
Replace a circuit board Burner control is
defective
Fuel pump connector
(CN14) is loose
connection Plug connector (CN14)
firmly
Measure voltage at
terminal for fuel pump
connector (CN14) on
burner control
Cord color: blue-blue
Standard value:
EPX1:
AC 120～180V
EPX5:
AC 60～96V
Replace a fuel pump
If it shows AC 120～
180V/60～96V, the pump
is defective
(Cord color & Standard value)
Remove an obstacle in fan
motor or replace a fan
motor 34 Fan motor is stuck Turn the fan by hand If the fan doesn't rotate or
does rotate hardly, the fan
motor is stuck
36
Disconnect a power
plug while the operation
switch is "ON"
Power supply is
recovered after power
shutdown such as a
blackout while the
operation switch is
"ON"
Overheat, tip-over and overvoltage lamp is lit (Abnormal fan speed detection is working)
Switching "OFF" and
"ON"
Replace a fan motor If it shows AC 230V/120V,
fan motor is defective Measure voltage at
terminal for fan motor (CN
15) on burner control
Standard: EPX1 AC230V
EPX5 AC120V
If it shows AC 0V, burner
control is defective Replace a burner control
If the heater works, power
supply is shut down while
the operation switch is
"ON" Once the operation switch
is "OFF", then turn on the
operation switch again
Ignition transformer is
defective Take an ignition
transformer cord out from
electrode, then measure
resistance of ignition
transformer
Fan motor is defective 35
Not applicable in above
38
If it shows AC 0V, burner
control is defective
43
Replace an ignition
transformer
EPX1 black-black (thick):
approx. 3kΩ
EPX5 black-black (thick):
approx. 4kΩ