No Heat Or Heat Too Low - Sunrise spas Classic Collection Series Owner's Manual

Probable Transformer fuse blown in spa pack.
cause #3:
Action: Locate fuse in spa pack, test and/or replace. Or contact dealer for service.
Probable Insufficient line voltage to power up spa pack processor.
cause #4:
Action: Contact electrician to measure line voltages and inspect supply connections.

No Heat or Heat Too Low

Probable Set point is not at desired level.
cause #1:
Action: Review set point and change if necessary.
Probable Circ pump is not running or pumping.
cause #2:
Action: Check if valves on circ pump/heater system are open (handle pulled up exposing valve shaft,
safety clips should be in place to prevent valve closure). Check if circ pump is plugged in or if
circ pump fuse in spa pack is burnt out.
Probable Spa is not covered when not being used.
cause #3:
Action: Cover spa to retain heat.
Probable Heater is not on due to error message showing on display.
cause #4:
Action: Check for open gate valves on equipment, correct low water level in spa, and examine condition
of filter cartridge(s). Turn spa power off then back on. Monitor for reoccurring error message on
display. Contact dealer if problem persists.
Probable System Input current setting is restricting heater operation.
cause #5:
Action: Consult dealer/electrician on system current setup and if a higher input current is available
from the supply. This may mean rewiring the spa with a larger gauge cable and/or breaker.
Probable Lack of insulation in a custom installation.
cause #6:
Action: Protect underside of spa from prevailing cold winds or snow. Enclose custom installations.
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DOC: OM-SUNRISE-18E
European Sunrise Spas 2018 Owner's Manual