Troubleshooting Guide - Hayward MICRO HP2021DT3C Manuel D'instructions Et D'installation

8. APPENDICES (continued)

8.3 Troubleshooting guide

Repairs and maintenance must be carried out by a qualified technician.
For more information, contact customer service.
Problem
High pressure fault
Low pressure fault
Flow detector fault
Inflow/outflow temperature
difference > 13°C
Communication problem
Water inlet sensor fault (IT)
Water outlet sensor fault (AT)
Outside temperature sensor
fault (OT)
De-icing sensor fault (CT)
Compressor backflow sensor
fault
Operating limit reached
22
Error
Description
codes
Pressure in the refrigerant circuit is
too high,
E01 or water flow is too low,
or evaporator is blocked,
or air flow is too low.
E02 Bypass open
Water flow is insufficient or the
E03
detector is in short-circuit or defective.
E06 Insufficient volume of water flow
Problem with the LED controller or the
E08
PCB connection.
P01
P02
The sensor is open or short-circuiting
P04
P05
The sensor is open or presents a
P081
short-circuit.
TP Ambient temperature < 10°C
Solution
Verify the high pressure switch and
the refrigerant circuit pressure.
Verify the water or air flow.
Verify that the flow switch is working
correctly.
Verify the water inlet/outlet valve
openings.
Check the bypass valve setting.
Verify inlet T2 on the diagram.
Check the water flow.
Verify the filtration pump and the
flow detector to see if they have any
possible problems.
Verify the water flow or check if there
is a system obstruction.
Verify the connection of cables.
Verify or replace the sensor.
Verify or replace the sensor.
Shut off the heat pump.