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Hayward Heat Relax Manual

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6. APPENDICES (continued)
6.4 Troubleshooting guide
Fault Error codes Description Solution
Water inlet sensor fault P01 The sensor is open or has
short-circuited. Check or replace the sensor.
Water outlet sensor fault P02 The sensor is open or has
short-circuited. Check or replace the sensor.
Outside temperature sensor
fault P04 The sensor is open or has
short-circuited. Check or replace the sensor.
De-icing sensor fault P05 The sensor is open or has
short-circuited. Check or replace the sensor.
High pressure protection E01
Refrigerating circuit pressure
too high or water flow too low
or coil obstructed or air flow
too weak.
Check the high pressure switch
and the refrigerating circuit
pressure.
Check the water or air flow.
Check the flow controller is
working properly.
Check that the water inlet/outlet
valves are opening.
Check the by-pass settings.
Low pressure protection E02 Refrigerating circuit pressure
too low or air flow too weak or
coil obstructed.
Check the low pressure switch
and the refrigerating circuit
pressure to see if there is a leak.
Clean the coil surface.
Check the fan rotation speed.
Check the free circulation of air
through the coil.
Flow sensor fault E03 Insufficient water flow or
sensor short-circuited or faulty
Check the water flow, check the
filtration pump and flow sensor
for any faults.
Temperature difference too
great between the outlet and
inlet water E06 Insufficient water flow volume,
water pressure difference too
low/too high.
Check the water flow or for a
system obstruction.
Cold mode protection E07 Water output quantity too low. Check the water flow rate or the
temperature sensors.
Communication problem E08 LED controller or PCB
connection fault. Check the wiring.
Level 1 antifreeze protection E19 Air and inlet water temperature
too low. Turn off the heat pump and drain
the capacitor. Freezing risk.
Level 2 antifreeze protection E29 Air and inlet water temperature
even lower. Turn off the heat pump and drain
the capacitor. Freezing risk.
Certain operations must be performed
by an approved engineer.
… 68 …


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