Installation manual

16 Underfloor Heating
6. Troubleshooting
Normal system operating conditions:
The Power LED of the controller is lit up. The actuators are activated if there is demand for heating or cooling.
*
: To find out if a problem is caused by the supply system or the control system. Check the temperatures of the flow and
return pipes for the loop(s) corresponding to the room. Loosen the corresponding actuator(s) from the manifold. If the loop
temperature starts to rise after a short while (a few minutes for the flow and longer for the return pipe, depending on the
floor type), the problem is most likely caused by the room control system. If the temperature remains the same, the
problem is in the system (hydraulic).
Failure Causes Indication Solutions Note
room too cold (or
too warm in
Cooling mode)
*
thermostat is connected on
a bad channel
■ see Installation report and check
the wiring
■ the LED of the thermostat does
not switch on or off with heating or
cooling demand
actuator does not open
the white indication can not be seen
in the indicator window
■ replace the actuator
■ measure the outputs if 24V when
heat demand
the thermostat is out of
order
replace the thermostat
room too warm (or
too cold in Heating
mode)
*
thermostat is connected on
a bad channel
■ see Installation report and check
the wiring
■ the LED of the thermostat does
not switch on or off with heating or
cooling demand
actuator does not close
the corresponding loop is warm even
after a long period without heat call
■ check that the actuator is
correctly mounted
■ replace the actuator
the thermostat is out of
order
replace the thermostat
the floor is cold
■ no heat demand (from
underfloor heating
system)
■ the room is heated by
another heat source
■ The supply water is too
hot. This causes a hot
floor for a short while,
followed by a cold,
uncomfortable floor
room temperature OK, but the floor
is cold
the system does
not start
no voltage power LED off in controller
■ check that the controller is
connected to the mains and that
the wiring in the 230V
compartment is OK
■ check the circuit-breaker in the
principal electrical board
cable breakdown
230V in socket but not in 230V
compartment
replace cable and plug
the thermostat is
not supplied
problem with a terminal
block
the LED of the thermostat does not
switch on or off with heating or
cooling demand
check the terminal
cable breakdown
the LED of the thermostat does not
switch on or off with heating or
cooling demand
replace cable
the thermostat is out of
order
replace the thermostat
INSTALLATION_MANUAL_R3-04A.mif Page 16 Mercredi, 14. mars 2007 11:34 11