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Fault
Sources
Causes
Solutions
Supply air temperature too
low
The supply air temperature is below
the fixed limit P240
Operating problem with the supply
air temperature sensor
Check the operation of the sensor
Operating problem with the heating
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Supply air temperature too
high
The supply air temperature is below
above the fixed limit P241
Operating problem with the supply
air temperature sensor
Check the operation of the sensor
Operating problem with the heating
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Return temperature too low
The return temperature (or room
temperature) is below the fixed limit
P242 (or P244)
Temperature sensor operating
problem
Check the operation of the sensor
Supply air temperature limits
incorrectly configured
Check the configuration
Room temperature too low
Operating problem with the heating
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Return temperature too high
The return temperature (or room
temperature) is above the fixed limit
P243 (or P245)
Temperature sensor operating
problem
Check the operation of the sensor
Supply air temperature limits
incorrectly configured
Check the configuration
Room temperature too high
Operating problem with the heating
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Operating problem with the cooling
elements
Check the operation of the valves, heat
recovery unit, mixing box, etc.
Fresh air temperature sensor
Temperature measurement <-50° C
or >90° C
Temperature sensor open circuit or
short-circuit
Check the sensor wiring or replace the
sensor
Supply air temperature sensor
Return air temperature sensor
Room air temperature sensor
Additional casing supply air
sensor
Loss of communication with
Th-Tune
The Th-Tune is no longer
communicating with the PLC
The wiring between the PLC and the
Th-Tune is damaged
Check the wiring between the PLC and
the Th-Tune, check for the line
termination resistors
Coil 1 pump fault
The pump motor is indicating a fault
Reversal in fault contact direction
Check parameters P362 and P363
Coil 2 pump fault
Overvoltage, motor overload, motor
power supply problem, etc.
Check the condition of the pump motors
7 - FAULTS
48
Summary of Contents for 39HXC
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