Parker AQUA DUO A455C-2800, Technical Manual

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The Control Printed Circuit Board may not be delivering 12 VDC to the solenoid.
The 3-way Diversion Valve is receiving 12 VDC when the Water Quality less than 1000ppm safe
water and the valve’s solenoid coil is not defective, the valve’s solenoid coil is warm or hot to the
touch, however the Diversion Valve does not divert potable water to the post filtration section
and on to the
boat’s potable water storage tank.
The Diversion Valve internal ports may have been moved by over tightening of the black
tube fittings causing blockage internally and require adjustment. Remove Diversion
Valve from the system and adjust ports.
High Pressure Pump & Motor Abnormalities
Troubleshoot electric motor failure to ensure that any abnormality from the power, wiring, wiring
connections, contactor, or control circuit are not at fault or at cause. If the electric motor has failed, it will
require replacement. Depending upon failure, replacement may be more cost effective than repair. If failure
of the motor is due to external source, not the motor itself, then correct the cause or else the
replacement or repaired motor will fail again.
*Failures of the electric motor may be:
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Bearing failure: Replace motor.
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Winding failure: Generally caused by low or high power, below or above the specified voltage
requirements of the system and feeding the motor. This is NOT economically repairable.
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Capacitor failure: Generally caused by low power feeding the motor. Also caused by rapidly
repeating starting and stopping of the motor. Replace motor.
Potential Scenarios:
High Pressure Pump flow is normal when the system operating pressure is below 100 PSI, but the flow
drops or becomes erratic and pulsates as pressure is applied.
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Worn High Pressure Seals from normal use require replacement.
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Worn High Pressure Pump valves, valve seats, valve springs and/or valve seat "O" rings are
broken or warn due to normal use and are allowing internal by-passing. Repair the pump with a
Valve and Seal Kit.
Pump is noisier than usual, and pulsations are observed in hoses and gauges.
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Worn or broken Valve, Valve Spring, or Valve Seat. Repair the pump with a Valve and Seal Kit.
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Pump is cavitating and not receiving sufficient feed water at its inlet due to blockage prior to the
pump’s inlet port. Clear the blockage in the feed water line.
High Pressure Pump Leaks Oil
Determine source of leak and replace appropriate associated seal.
High Pressure Pump leaks water between manifold and Drive End
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Worn Inlet Packings due to normal use.