Master Spas Air Lock in Pump or Plumbing

Pump runs but no water comes out of jets after draining and refilling spa

Advertisements

Possible Causes

Air trapped in pump wet end, Improper refill procedure, Closed slice valves, Suction blockage at skimmer or filter

How to Fix / Troubleshooting

Safety first: Turn off power before loosening any unions or fittings.

  • Verify water level: Ensure the spa is filled above all skimmer openings.
  • Open slice valves: Confirm all slice valves around the pumps and heater are fully open.
  • Bleed air from pump: Loosen the union on the pump discharge or suction side until air escapes and water begins to seep out, then retighten.
  • Prime via hose: Insert a garden hose into the filter compartment and force water down into the suction line to help push air out.
  • Restart pump: Turn power back on and run the pump. Repeat bleeding if necessary until strong flow returns.
Advertisements

Repair Difficulty

Easy 2/5
Advertisements