Questions & Answers for: Hayward thermo sensor

...this serviced 2-3 months ago and it worked fine twice. Any ideas on how to fix this? Thanks! try to replace the thermo sensor it is located on the left side of tghe unit and has 3 wires running to

...thermo sensor.not much left to replace You didn't indicate your exact model. There are different versions of the H200 series. If it is milivolt then there is no electric, Must have correct milli-volt ...

...operated fine until this week. the flame sensor/thermo couple can be bad and or needs cleaning --carbon build up [one day old -one year old- 20 yrs old defective or damaged parts can happen any

thermo-expansion sensor. It relies on the thermo-expansion properties of a non-compressible fluid to operate the thermostat switch. Take care to not crush or kink the capillary tube between the sensor