Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
E4
Evaporator Coil
Temperature 1
Sensor
Malfunction
1) The evaporator coil temperature sensor
1 is damaged
replace the sensor
E5
Evaporator Coil
Temperature 2
Sensor
Malfunction
1) The evaporator coil temperature sensor
2 is damaged
replace the sensor
E6
Insufficient
Water Flow
Protection
1) Loop wire terminals 1 and 2 (no matter
whether water flow switch is installed) to
see if E6 still shows up. If yes, the
mainboard is defected.
Replace mainboard
2) The wires of water flow switch has a
poor contact to the mainboard.
Improve the contact
3) The water flow switch circuit is not
closed.
a. Check if there is water in the water
tank;b. if no in a, check if the water
pump is running;c. if no in b, check if
there is 220V volt supply to the water
pump; d. if no in c, mainboard is
defected. If yes in c, the water pump is
defected.
E7,E9
High Pressure
Protection
1) The water pump is too small. The
insufficient water flow results in gas
discharge temperature protection.
a. check if there is water flow from the
outlet; If no, check if the water pump is
defected;If water pump is defected,
replace it; b. start the unit and let it
operate for 15 minutes ( if it can).
Check if the temperature difference
between water inlet and outlet is bigger
than 5~7C. If yes, the water flow is too
small. Change to a bigger water pump.
c. If b is okay, check if there is
condensation water on the suction pipe
of the compressor. If no, there is a gas
leakage. Check where the leakage is.
Discharge the gas and solder the hole.
Then vaccumize the system and fill
gas. d. Start the unit, but do not give
power supply to the compressor. Check
if E7/E9 error code still shows up. If
yes, check if the 2.4~3.0Mpa high
pressure switch is disconnected. If yes,
replace it. If not, the mainboard is
defected. Replace the mainboard.
2) The water pump is installed in the
wrong direction or the three phase water
pump is running in the opposite direction.
3) Air exists in the water pump.
4) The particle filter on the inlet water pipe
is blocked.
5) The pipe diameter is too small or there
is a bottleneck restriction.
6) Insufficient refrigerant in the system so
that the compressor discharge temp is
higher than 110C
7) The high pressure switch is damaged
8) The thermo switch has a poor contact to
the mainboard.
9) The thermo switch is damaged.
10) The mainboard is damaged.
E8,E10
Low Pressure
Protection
1) All gas has leaked out.
a. Check the readings of high pressure
and low pressure manometers. If the
readings are 0, all gas has leaked out.
Check where the hole is and solder it.
