Hi Rick, where do I find this information on the heater?
I live in a downstairs flat and the bathroom in the flat above had a leak and the cupboard where the heater unit is got very wet. I can only imagine that the heater had some cut out mechanism when this happens. there are two thermostat covers which when removed have a red dial that you move manuallly to adjust the temprature. I don't know if this information helps you understand my problem further.