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www.ehs-heating.com
E0
Self-checking fault
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.
E2
Electric leakage on
system
Check whether the external power supply has
leakage or whether there is condensation or
water leakage on the main circuit board.
1.
Switch off the boiler
2.
Qualified engineer to open cover and
dry/inspect circuit board.
E3
Heating
Water
Temperature Sensor
broken/loose
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.
E5
Domestic hot water
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
E9
Antifreeze fault
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.
EC
Display
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.
F1
Dry Fire Protection
No Water Flow
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
F4
Water Pressure Fault System is low on water
1.
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.
F6
No water flow
circulation
Air in the system, no water or water
pump not working, pump is blocked,
water flow switch blocked, water
flow switch is faulty.
1.
Vent system.
2.
Check system pressur
e
.
3.
Check pump and flow switch for
blockage/operation
Error
Code
Protection Function
Potential Cause
Potential Solution
