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6. Maintenance and Inspection
6.1 Maintenance
Check the water supply device and the releaser often. There should always be water entering the
system. The condition air entering the system should be avoided, or it will influence unit's
performance and reliability. You should clear the water filter regularly to avoid damage to the unit
because of a jammed filter.
The area around the unit should be dry, sanitary and ventilated. Clean the side of the heating
exchanger regularly to allow proper heating exchange and save energy.
Check the operation of every process in the unit, and the pressure of the refrigerant system. Check
the power supply and cable connections often. If the heat pump is operating abnormally, or
producing a bad smell, immediately shut it off and contact a qualified technician.
Please discharge all water in the heat pump and water system to avoid freezing of the heat pump or
water system. You should discharge the water at the bottom of the heat pump if the unit will not be
used for a long time. Check the units thoroughly and fill the entire system with water before
powering the units on again.
6.2 Trouble shooting guide
MALFUNCTION
CONTROLLER
DISPLAY
REASON
RESOLUTION
Water in temp. Sensor
failure
PP 01
The sensor is open or short
circuit
Check or replace a new sensor
Water out temp. Sensor
failure
PP 02
The sensor is open or short
circuit
Check or replace a new sensor
Coil sensor failure
(Heating mode)
PP 03
The sensor is open or short
circuit
Check or replace a new sensor
Gas return sensor
failure
PP 04
The sensor is open or short
circuit
Check or replace the sensor
Ambient sensor failure
PP 05
The sensor is open or short
circuit
Check or replace the sensor
Temp. is too much
different between water-
in and water-out
PP 06
Water volume isn’t enough
Increase water volume
Anti-freezing under
cooling mode
PP 07
Ambient temp. too low
The first time freezing
protection in winter
PP 07
Ambient temp. too low
18


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