Spa heats very slowly or cannot reach set temperature, especially in cold weather.

Safety first: Any electrical configuration checks should be done with power off by a qualified person.

• Step 1 – Verify power configuration: Confirm whether your Nordic spa is wired for 120V or 240V. A 120V configuration will heat much more slowly and may struggle in winter.
• Step 2 – Inspect spa cover: Check that the Nordic cover seals tightly around the shell. Replace if the foam is waterlogged or the vinyl is torn.
• Step 3 – Check for cabinet leaks: Inspect the cabinet panels for gaps or missing insulation that allow heat to escape. Repair or add insulation as appropriate.
• Step 4 – Limit heat loss: Keep the cover on whenever the spa is not in use. Avoid frequent long soaks with the cover off in very cold weather.
• Step 5 – Test heater output: Measure water temperature rise over 1–2 hours with the cover on. If the rise is minimal, test the heater element resistance and replace if out of spec.
• Step 6 – Consider 240V upgrade: If your model supports it, have an electrician rewire the spa to 240V per Nordic specifications for faster heating.