Coleman inflatable spa (Lay-Z-Spa style) shows no error but will not heat or filter; pump unit runs only in bubbles mode.

Safety first: Unplug the inflatable spa from the outlet before servicing. Do not open sealed electrical compartments unless you are qualified.

• 1. Reset unit: Unplug the Coleman inflatable pump/heater module for 5 minutes, then plug back in and attempt to start filtration/heating mode.
• 2. Clean filter: Remove the small screw-on filter cartridge inside the spa and rinse thoroughly. Ensure the internal intake screens on the pump unit are clear.
• 3. Check modes: Verify you are selecting the correct filtration/heating mode, not just the bubble (air) mode.
• 4. Inspect for overheating: If the unit shuts off after a short time, internal thermal protection may be tripping due to blocked vents or internal failure. Ensure the pump module vents are unobstructed.
• 5. Replace pump/heater module: If the unit will not enter or stay in heat/filter mode, the sealed pump/heater module is likely defective and must be replaced as a complete assembly with a Coleman-compatible unit.