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

Safety first: Ensure GFCI protection is present. Turn off power before opening the equipment bay.

• 1. Verify mode and set point: Confirm the spa is in Standard mode and set to your desired temperature.
• 2. Check cover condition: Inspect the PDC Spas cover for waterlogging, tears, or poor seal. Replace if heavy or damaged, as this greatly increases heat loss.
• 3. Confirm circulation: Ensure the circulation pump runs as scheduled and that there is steady flow through the heater.
• 4. Test heater output: Measure water temperature rise over 1–2 hours with the cover on. Minimal or no rise may indicate a weak or partially failed heater element, which should be replaced.

If the spa still cannot reach temperature after addressing cover and heater issues, a technician should check electrical supply (correct voltage) and control pack operation.