62
tRoUBlESHootIng And ERRoR/FAUlt MESSAgES
tRoUBlESHootIng
13.0
13.1
Problem
Possible cause & Solution
Mixing valve does not operate correctly
(When in install mode)
Incorrect connection, see master wiring diagram for correct connection.
Valve/actuator assembly is incorrect.
Actuator is faulty.
Check what happens if sensor and/or outdoor module is missing.
(Valve cycles between open and closed
in normal operating mode)
Valve may be oversized.
Supply Limit sensor may be subject to heat migration.
Upstream water temperature is excessively high (these problems may be corrected by changing PI settings – please refer to the
REHAU Intelligent BA Heating/Cooling Controls, Technical and Installation Manual).
Room is too cold.
(After running for at least 48 hours)
The Room Sensor is placed in a position that does not represent the general temperature in the room. E.g. mounted on external wall
or near an extraneous heat source.
If the room is controlled by a CT2 Programmable Room Sensor, check that the time and temperatures are set correctly.
If the Room Sensor has got an override switch (TM or TD), the switch may be set in the “off” or “night” position.
For rooms with floor sensors, the maximum floor limit setting could be preventing the room reaching the desired temperature.
Insufficient heating capacity of the system.
Bad insulation creating large heat loss.
Room is too hot
(After running for at least 48 hours)
This could be caused by draughts within the wall cavities.
The Room Sensor is placed in a position that does not represent the general temperature in the room.
If the room is controlled by a CT2 Programmable Room Sensor, check that the time and temperatures are set correctly.
If the Room Sensor has got an override switch (TM or TD), the switch may be set in the “day” position.
For rooms with floor sensors, the minimum floor limit setting could be increasing the room temperature above the desired setting.
Solar gain or extraneous heat source.