Parker AQUA DUO - A455C, Technical Manual

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Repair the pump with a Seal Kit.
If the High-Pressure Pump electric motor fails to operate, follow these steps to isolate the problem:
1. Ensure that the system is receiving proper power from the power source.
2. Press “Start” switch to activate the motor. It will take approximately 10 seconds before the
High-Pressure Pump Motor starts. Do not press any other switch.
3. Measure the AC voltage between terminals 4 and 5 (AC Systems) on the main terminal strip.
4. If the voltage measured in the step 3 above matches the system voltage, then problems
may be in the power cable attached to the motor or the motor internal wiring or
windings.
5. If low or no voltage is present in step 3 above, then check for proper operation of the
High-Pressure Pump Contactor. To deactivate the contactor, press the
“Stop” switch
twice. To activate the contactor again, press the “Start” switch.
6. If the contactor is mechanically operating, but no voltage is present at the motor
terminal (step 3 above), then the High-Pressure Pump Motor contactor may be at fault.
7. If the contactor does not operate mechanically, then measure the DC voltage between A1
and A2 terminals on the High-Pressure Pump Motor contactor coil. It should read 12V DC
when activated.
8. If the contactor coil is receiving 12V DC but inoperative then the contactor’s coil may
be bad. Replace the contactor.
9. If 12V DC is not present when the High-Pressure Pump is activated, trace the orange and
orange/black wires to the main circuit board and measure the DC voltage at the
terminals. It should read 12V when activated.
7.4 Booster Pump Abnormalities
If the Booster Pump electric motor fails to operate, follow these steps to isolate the problem:
1. Ensure that the system is receiving proper power from the power source.
2. Press “Booster Pump” switch to activate the motor. Do not press any other switch.
3. Measure the AC voltage between Terminals 1 and 2 on the main terminal strip in the
controller.
4. If the voltage measured in the step 3 above matches the system voltage, then problems
may be in the power cable attached to the motor or the motor internal wiring or
windings.
5. If low or no voltage is present in step 3 above, then check for proper operation of the
Booster Pump Contactor. To deactivate the contactor, press the
“Stop” switch twice. To
activate the contactor again, press the “Booster Pump” switch.
6. If the contactor is mechanically operating, but no voltage is present at the motor
terminal (step 3 above), then the Booster Pump Motor contactor may be at fault.
7. If the contactor does not operate mechanically, then measure the DC voltage between
A1 and A2 terminals on the Booster Pump Motor contactor coil. It should read 12V DC
when activated.
8. If the contactor coil is receiving 12V DC but inoperative then the contactor’s coil