Service manual36
TROUBLESHOOTING Pump 1 Does Not Work!
If pump 1 does not work, proceed as follows:
2• Verify if the "Pump 1" marker is
displayed when you press the
respective key.
4• If the "Pump 1" marker is displayed
when you press the respective key,
verify if pump 1 is running (at either
speed).
Verify jumper JMP3 position:
Position 1: two-speed pump
Position 2: single-speed pump
Modify the jumper position if
necessary, referring to the respective
section of this manual.
1• Verify if an error message is displayed
on the top side control. If so, refer to
the message specific section of this
manual.
3• If the "Pump 1" marker is not
displayed, use a spare top side
control to see if the first is defective.
In the latter case, replace the
defective top side control.
If the original top side control is not
defective, replace the board referring
to the "How to Replace the Board"
section of this manual.
"Pump 1" marker
Jumper location
To increase the lifetime of the relay, a circuit called "snubber" is used on the pump relay.
With this type of circuit, if no pump is connected to an output and the relays are open, the
multimeter will still read voltage of around 60 V. This is normal.
It is important to measure voltage when the pump is powered on!
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