One or more heating loops is not functioning

  1. Check that the circulation pump works.

  2. Check with your hand on the feed pipe (supply pipe). It should be as warm as the other feed pipes. Is it colder? Inspect if the valve pin (under the actuator) is stuck in closed position, or if the balancing (adjustment) valve is screwed into the bottom. See section: Balancing UFH 1.

  3. Check the thermostat and function of the actuator. See section: Verify Thermostat and Verify Actuator.

  4. If the supply pipe is still cold, there may be air in the heating loop that prevents water circulation. See section: Loop Bleeding.

If the fault has been a long time, it may be that the heating loops never been or is wrong balanced. See section: Balancing UFH 1.


Tools

You need an allen wrench to the balancing (adjustment) valves. A phillips screwdriver to open the master unit and a wrench to remove the caps above the balancing valves. Sometimes you also need a polygrip pliers.


In order to perform the control measurement you need an IR thermometer with laser pointer, for precise and fast reading temperatures. The pointer marks the measurement range with a red dot. The cost for above professional IR thermometer is around $70. Important! the IR-sensor in the thermometer must have the same temperature as the indoor temperature, otherwise will the measurement be wrong. A cold thermometer from outdoors may need 30 minutes indoors before the IR-sensor measures right.