[BUG] Sudden call for heat

[craigmcfly]

At 23:25, the controller suddenly called for heat. It had been at a steady temperature of 9C for weeks.

All I can see in the log is (in reverse order)

layzspa Heater cleared (no heat detected)
23:25:51 - 2 hours ago
layzspa Temperature control changed to Heat
23:25:36 - 2 hours ago
layzspa Heat regulation turned on
23:25:36 - 2 hours ago
layzspa Heater detected heat
23:25:36 - 2 hours ago
layzspa Temperature control changed to Fan only
23:25:35 - 2 hours ago
layzspa Heat regulation turned off
23:25:35 - 2 hours ago
layzspa Heater cleared (no heat detected)
23:25:35 - 2 hours ago
layzspa Temperature control changed to Heat
23:25:20 - 2 hours ago
layzspa Heat regulation turned on
23:25:20 - 2 hours ago
layzspa Heater detected heat
23:25:20 - 2 hours ago

and it's been doing that ever since.

I have now manually set it to fan only and it has stopped doing it.

The only other log entries of interest are occasional alternating "lock turned on" and "lock turned off" but I don't know if that's a heartbeat you deliberately set up.

How can I investigate why it suddenly called for heat?

Firmware: 2025-10-12-1800

[Skeletorjus]

Could it be the Lay-Z-Spa freeze shield kicking in?

[craigmcfly]

Could it be the Lay-Z-Spa freeze shield kicking in?

possibly, but that normally kicks in at 5C not 9C

[Skeletorjus]

According to this site the heat will be turned on when the ambient temperature drops below 6°C, maybe that's what happened?