Sensorfout, temperatuurfout of doorstromingsfout:

Bad connection: -- check the wiring

Sensor not or poorly connected:-- Check the proper functioning of the sensor-- Check whether the sensor is properly mounted

Defective sensor: -- replace the sensor if necessary

No or too little flow:-- Vent the central heating system-- Check the water pressure-- Check the heat exchanger for contamination

Flow direction wrong: -- check the flow (direction, pump, valves)