26 www.ehs-heating.com
of leakage circuit
Circuit board is damped, or temperature
change causes water mist.
1. Check whether a signal line on the
electric leakage protection coil has
fallen off or not.
2. Replace PCB.
system
Check whether the external power supply has
leakage or whether there is condensation or
water leakage on the main circuit board.
2. Qualified engineer to open cover and
dry/inspect circuit board.
Temperature Sensor
broken/loose
Sensor is in short circuit or open circuit.
Check if the sensor connection is
loose or not.
2. If broken contact EHS customer
service to replace sensor.
temperature sensor
broken
Sensor is in short circuit or open circuit.
1. Check if the sensor connection is
loose or not.
2. If broken contact EHS customer
service to replace sensor
Heating water temperature is too low
1. If the heating pipework is frozen, the
boiler will not be able to work.
2. Clean pipeline, refill the water then
switch on.
Disconnected from
PCB
Display Disconnected from PCB
1. Check whether the connection
between the cable and the PCB is
broken or loosen.
2. If broken Contact EHS customer
service to replace cable/PCB.
1. Check whether the water flow circuit
is ok or not. Check Isolating valves are
open.
2. Fill system and vent Press and hold
TIME key for 6 seconds to re-set
Fill to correct pressure with filling
loop
2. Check whether the water pressure of
the system drops and check for leaks.
3. Check whether the pressure switch is
blocked, or it has fault.
circulation
Air in the system, no water or water
pump not working, pump is blocked,
water flow switch blocked, water
flow switch is faulty.
2. Check system pressure.
3. Check pump and flow switch for
blockage/operation
Code
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