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3.3failure recovery
Diagnosis
The boiler is equipped with advanced self diagnosis system. If a fault occurs, the boiler will
display the corresponding code on the display screen. There are some failures (showing "A")
to stop the boiler. If you want to resume operation, you must catch the reset button for 1
seconds. Other faults (indicating "F") result in shutdown. The boiler can run automatically
when the fault is removed and automatically reset.
The reasons for the failure of the part of the fault table listed below and the methods that
users can solve themselves.
If the fault is solved for the two time, you can not exclude it. Please contact the Thermex
service staff.
Fault description Code possible reason Solution
Heating system water does not circulate
temperature limiter
fault
temperature limiter damage
more air in heating system
the heater is
over 90
Abnormal
temperature
rise
CH NTC fault
outdoor NTC fault
Tank NTC fault
WPS fault
No circultate
electric leakage
Heating system water does not circulate
more air in heating system
Temperature sensors detect (normal
heat for 5 minutes,the NTC of the
heating or the NTC of hot water detect
the temperature change are not more
than 3 , and more than 40 no
longer detect)
NTC open circuit, short circuit or wire loose
NTC open circuit, short circuit or wire loose
NTC open circuit, short circuit or wire loose
water pressure switch fault
water shortage in system
water shortage in system
pump fault
check wire
no heating
check the positioning and operation
of the heating sensor
check pump and empty air in system
check pump and empty air in system
check pump and empty air in system
check CH NTC or change
check wire or change NTC
check wire or change NTC
check wire or change NTC
ll the system to 1-1.5bar
check the water pressure switch
ll the system to 1-1.5bar
check pump
A02
electric leakage
AC contactor failer check AC contactor
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