Hot Water Overheat Alarm; Sensor Fault Te0-Te2 - ComfortZone RX35 User And Installation Manual

ComfortZone RX35/RX50/RX65

13.7 Hot water overheat alarm

Cause:
Measure:

13.8 Sensor fault TE0-TE2

Cause:
(AA) Air the system. Bleed the radiators/floor heating from air.
(BB) Check that there is circulation in the system.
(CC) Reset the alarm by pressing firmly on the red pushbutton
to the overheat protection located next to the type plate, left
side about 45 cm from the floor.
On heat pumps with software version 1.5 and earlier, the alarm
is reset by pressing both the red push button and resetting the
alarm on the display.
(DD) Reset the alarm
(EE) If the alarm is reactivated, contact your service provider.
The gear valve is stuck in the VV position.
(FF) Fault in the shift valve, connection cable or the gear valve
relay in the control.
- Check if the gear valve can be controlled or not by going to
Advanced settings / Heat pump settings / VP test /.
Set VP test to, Yes
Set Hot water to alternate mode Yes and No and check that the
gear valve switches position. The red indicator washer should be
rotated about 1/6 turn at each shift. If the gear valve cannot be
controlled in this way:
(GG) Break the main switch.
(HH) Check that the gear valve is properly fitted and
secured with the locking bracket.
(II) Check that the fuse for the gear valve (F1 in the control unit) is
full.
(JJ) Check that the cable connection is properly mounted in
the gear valve.
(KK) Check that the connection cable is properly mounted in
the control unit.
If no fault is found, pull out the connector M3 from the control
card, turn on the main switch again and measure the voltage
directly on the contact pins between pin 1 and pin 3, ie the two
upper pins.
In hot water mode - Yes
In circulation mode - No
If the voltage on the M3 connector switches as above, the
control board will work correctly and the fault will be in the
gear valve motor or in the gear valve cable.
If the voltage does not change, the control card is faulty and
this must be replaced.
This is because the sensor's measured resistance value is
outside the specified range 0.5 - 1.5 kΩ.
Depends on a gap in the contact, interruption or short circuit in
the sensor or transducer circuit.
Note that sensor faults are often intermittent, i.e. the sensor is
functioning correctly in the case of control measurement, even
though there is a loose contact inside it and the problems
49
service & maintenance
230 V~
max 50V~