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Diagnostic Guide & Common Corrective Actions #
Overview #
The Mach 5 Fresh Water Pump is designed to provide reliable, on-demand domestic water pressure throughout your Ocean Alexander yacht. The pump features intelligent electronic controls with built-in dry-run protection, automatic restart capability, and system diagnostics to help protect the pump from damage.
If the pump is not operating correctly, many common issues can be diagnosed and corrected without component replacement. This guide outlines the most common symptoms, likely causes, and recommended corrective actions before requesting service or submitting a warranty claim.
Common Symptoms #
The following symptoms are the most frequently encountered during operation:
- Pump will not start.
- Pump runs continuously.
- Pump repeatedly cycles on and off.
- Low or inconsistent water pressure.
- Pump loses prime.
- Dry-run shutdown.
- No water flow.
- Excessive pump noise or vibration.
Troubleshooting Guide #
Pump Will Not Start #
Check the following:
- Verify the DC breaker or fuse has not tripped.
- Confirm battery voltage is adequate.
- Verify power is present at the pump.
- Inspect electrical connections for corrosion or loose terminals.
- Reset the pump controller if required.
Pump Runs but Produces No Water #
Possible causes include:
- Pump has lost prime.
- Empty freshwater tank.
- Closed supply valve.
- Air leak in the suction line.
- Blocked inlet strainer.
- Obstructed suction hose.
If the pump has lost prime, follow the Mach 5 Pump Priming Procedure before further diagnosis.
Pump Runs Continuously #
Possible causes include:
- Water leak within the freshwater system.
- Open faucet or appliance.
- Air leak on the suction side.
- Pressure switch unable to reach shutoff pressure.
- Internal check valve leakage.
Inspect the entire freshwater system for leaks before servicing the pump.
Low Water Pressure #
Inspect for:
- Dirty inlet strainer.
- Restricted plumbing.
- Partially closed valves.
- Air trapped in the system.
- Worn pump components.
- Excessive demand exceeding pump capacity.
Pump Cycles Frequently #
Rapid cycling may indicate:
- Small plumbing leak.
- Faulty accumulator tank.
- Low accumulator pressure.
- Internal pressure loss within the pump.
- Air entering the suction line.
Pump Shuts Down During Operation #
The Mach 5 incorporates automatic dry-run protection.
The pump may stop if:
- Freshwater tank is empty.
- Pump loses prime.
- Air enters the suction line.
- Water supply is interrupted.
After correcting the cause, reset the pump using the control panel or by cycling power as outlined in the manufacturer’s instructions.
Preventative Maintenance #
Routine maintenance greatly improves pump reliability and service life.
Recommended preventative maintenance includes:
- Clean the inlet strainer regularly.
- Inspect suction hoses for leaks or loose clamps.
- Exercise the pump routinely.
- Maintain proper freshwater tank levels.
- Inspect electrical connections for corrosion.
- Check for plumbing leaks.
- Prime the pump immediately after maintenance or system draining.
Reference Documentation #
For detailed operating procedures, priming instructions, specifications, and repair information, refer to the accompanying Mach 5 Fresh Water Pump Operation and Service Manual.
East Coast Yacht Group
2955 West State Road 84
Fort Lauderdale, FL 33312
Service Department
954.530.2033
Contact our Service Department today to learn how we can help ensure safe and peak performance for your vessel.
