Lay-Z-Spa does not heat the water; temperature stays the same or drops even though heater icon is on and no error code is shown.

Safety first: Unplug the spa before touching electrical components. Do not cover the pump/heater unit while operating.

• 1. Confirm settings: Ensure the set temperature is higher than the current water temperature and that the heater function is actually enabled.
• 2. Check heat over time: Run the heater for at least 2–3 hours with the lid closed and insulated. Measure water temperature with an external thermometer. A Lay‑Z‑Spa typically heats 1–2°C per hour depending on ambient conditions.
• 3. Reduce heat loss: Use the inflatable lid and top cover, add a ground mat or insulation under the spa, and shield from wind.
• 4. Inspect for scale: Heavy limescale on the heater can reduce efficiency. Run a descaling treatment through the system and flush thoroughly.
• If there is still no noticeable heating: The heater element or control relay may be partially failed. This requires electrical testing and likely replacement of the heater assembly or pump/heater unit by a professional.