PAGE 20
VAL6 EPX Trouble Shooting
No.
Possible Cause
How to check
Result
Remedy
87
Replace a burner control
Not applicable in above
84
86
Thermistor
(Temperature sensor)
is defective
85
Thermistor
(Temperature sensor)
connector (CN 17) is
If it works normally,
adjustable resistor
connector fails on contact
Plug connector (CN 16)
firmly
Adjustable resistor
(Internal thermostat
cable) connector (CN
16) is loose connection
83
Plug adjustable resistor
connector (CN 16) again
Replace a Thermistor
(Temperature sensor)
Adjustable resistor
(Internal thermostat
cable) is defective
Plug connector (CN 17)
firmly
Disconnect adjustable
resistor connector (CN 16)
from burner control, then
measure coil resistance
values
(Standard value on each
scale)
Ext. thermo - 0Ω
Scale 3 - 1kΩ
Cont. - 2kΩ
Plug thermistor connector
(CN 17) again
If it works normally,
thermistor connector fails
on contact
If it shows ∞Ω or
considerably abnormal
value, the adjustable
resistor is defective
Disconnect thermistor
connector (CN 17) from
burner control, then
measure coil resistance
values
0℃
- 24kΩ
10℃ - 19.5kΩ
20℃ - 13kΩ
30℃ - 8.9kΩ
If it shows ∞Ω or
considerably abnormal
value, the thermistor is
defective
(Standard value on each
preset temperature)
Replace an adjustable
resistor (internal
thermostat cable)
Summary of Contents for VAL6 EPX Series
Page 1: ...VAL6 EPX Maintenance Manual ...
Page 2: ...1 Names of components ...
