ESIE13-02
Error Codes: Hydro-box
99
Part 4 – Troubleshooting
4
3
4
5
4
[1]: When the pump starts (push the ON/OFF button), manometer needle moves, pump vibrations
can be detect. In case unclear perform item A.
[2]: When the pump runs, pump signal is displayed on the interface controller. The pump will run for
15 seconds before error code 7H will be displayed.
In order perform item A completely, several pump restarts can be required.
[3]: Check the installation manual for the minimum required water pressure in the system.
[4]: Check the installation manual for the external static pressure values of the different pump
speeds.
[5]: Disconnect the connector of the flow sensor on the PCB (X4A) and measure the resistance value
on the connector of the flow sensor.
At a restart of the system, the pump will operate for 15 seconds before error code occurs.
Use these 15 seconds to confirm the voltages of the flow sensor before the pump will be stopped
due to error 7H.
No
Yes
No
No
Flow error occured during
defrost operation
Malfunction of the
backup heater
Yes
Check the thermal protector (Q1L)
of the backup heater
Yes
Check circuit for blockage
Check the backup heater fuse F1B
No
Replace hydrobox PCB
B
Yes
Yes
Replace the flow sensor
Is there 5V
between pin 3 & 4?
Check flow signal.
Pin 2-3 004: 0,7~2,3V
008-016: 0,6~2V
[5]
when the pump is running
check the flowsensor
Yes
No
Power supply (230V) towards
the hydro-box pump is OK
Hydro-box pump
is blocked
Replace the hydro-box pump
Yes
A
No
No
Replace the fuse (FU2)
Replace the hydro-box PCB (A1P)
Check if value for
fuse FU2 is OK
