Display shows Htr or HEAT ERR, heater icon flashes but water does not warm.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Open heater element, Tripped high-limit or thermal fuse on heater, Burned heater relay contacts on control board, Loose heater wiring connections

Safety: Turn off power at the GFCI. Heater testing involves live circuits and should be done by qualified persons.

Visual inspection: Open the equipment bay and inspect heater terminals and wiring for signs of burning or loose connections.
Check for leaks: Ensure there is no water leaking onto the heater terminals or control pack.
Professional testing: A technician can measure heater element resistance and verify voltage at the heater when the spa calls for heat.

Most Htr faults require replacement of the heater element or control board heater relay.

Professional Required 5/5

Heater element assembly

Check Price on Amazon

We may earn a commission from links on this page.