Davey Spa-Quip in line Heater Temp Sensor. Fits S P600, SP 601, SP 800, SP 1200 controllers with Titanium style heater after 2015. May be the cause of Error 8 / Error 08 / ER 08. Note that in some cases when a thermistor has failed or is giving false readings, there is underlying corrosion, and it may be best to replace the entire heater assembly.
These are held in by glued heat shrink which will need to be replaced.
Temperature Sensor Suits: Spa Power 400, 54500, 54500A, 500A MK2, Spa Power 500, Spa Power 600, Spa Power 800 , Spa Power 1200 heaters with Titanium element held in with two lock nuts.
Does NOT suit: pre-2016 heaters fitted with oval shaped element assemblies.