Installer reference guide / Mono tank integrated type 186
Fault Possible cause Remedy
The pump is blocked
• If the unit has been powered off for a long
time, lime might block the rotor of the pump.
• When a locked rotor occurs for 3 seconds, a
locked rotor fault is reported.
• The pump stops working and the
indicator(Both MAX & PWM LED) flashes 5
times.
• Every 8 seconds, the pump tries to re-start.
If the fault is not eliminated, after 5 failed
attempts the pump will no longer re-start.
• The indicator continues to flash. The pump
requires a power reset.
• If the fault continues, disassemble the pump
and clean and free the locked rotor.
• Flow error E911 is displayed.
• The pump is blocked or there is not sufficient
voltage towards the pump.
The pump is making
noise (cavitation)
• There is air in the system.
• Purge air from the system by opening the
automatic air vent.
• The water pressure at the pump inlet is
too low.
• Check and make sure that
– The water pressure is >1 bar.
– The water pressure sensor is not broken.
– The expansion vessel is not broken.
– The valve (if equipped) of the water circuit
towards the expansion vessel is open.
– The pre-pressure setting of the expansion
vessel is correct.
– The strainer is clean.
The pressure relief
valve opens
• The expansion vessel is broken or sized too
small for the total volume.
• Replace the expansion vessel or add another
after determining the needed expansion size.
• The valve (if equipped) of the water circuit
towards the expansion vessel is closed.
• Open the valve.
• The water volume in the installation is too
high.
• Make sure that the water volume in the
installation is below the maximum allowed
value.
• The water circuit head pressure is too high.
• The pressure relief valve is 3 bar. Check the
water circuit head pressure.
The water pressure
relief valve leaks
• Dirt is blocking the water pressure relief valve
outlet.
• Check that the pressure relief valve is
working properly by turning the valve on or
off.
• If the water keeps running out of the unit,
close both the water inlet and outlet shut-off
valves first and then if broken, replace it. The
system must have a good working pressure
relief valve for operating safely.
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