Therm-X MVHRU IOM
Page 98 of 108
Version 2.2, 18/06/2020
Error description
Unit behaviour
Potential cause
Potential solution
26 - Failure in the pressure sensor
of the exhaust filter
The unit is ventilating.
Defective or disconnected
pressure sensor.
Check whether the pressure tubing is kinked, disconnected or clogged by dirt.
Check that module F is connected and operating correctly.
The pressure sensor or module F might need to be replaced.
27 - Failure in the pressure sensor
of the inlet filter
The unit is ventilating.
Defective or disconnected
pressure sensor.
Check whether the pressure tubing is kinked, disconnected or clogged by dirt.
Check that module F is connected and operating correctly.
The pressure sensor or module F might need to be replaced.
28 - Failure in the pressure sensor
of the supply fan
The unit is not working.
Defective or disconnected
pressure sensor.
Check whether the pressure tubing is kinked, disconnected or clogged by dirt.
Check that module F is connected and operating correctly.
The pressure sensor or module F might need to be replaced.
29 - Failure in the pressure sensor
of the exhaust fan
The unit is not working.
Defective or disconnected
pressure sensor.
Check whether the pressure tubing is kinked, disconnected or clogged by dirt.
Check that module F is connected and operating correctly.
The pressure sensor or module F might need to be replaced.
30 - Failure in the pressure sensor
of the VAV supply duct
The unit is not working.
Defective or disconnected
pressure sensor.
Check whether the pressure tubing is kinked, disconnected or clogged by dirt.
Check that module F is connected and operating correctly.
The pressure sensor or module F might need to be replaced.
32 - Air quality sensor failure
The unit is ventilating.
Defective air quality sensor.
Check that the quality sensor is connected correctly and check that it is
operating correctly (output signal value 0-10V).
