There are 2 main causes: filter system does not work properly, so the water current can not enter into heating system or over-heating switch is tripped. Other causes include:
An airlock in the system – bleed air from the filter housing. The inlet or outlet holes inside the spa wall are clogged with dirt thereby reducing water flow – use brush to clean them to ensure the water flows into pump smoothly.
- Filter pump not working – Press filter button to check that idt functions properly.
- Temperature control switch is tripped because the temperature inside the heating tube is too high (LED display may read ‘E3′ error) – Refer to your Instruction Manual and perform a restart.