The original Honeywell fan control/overheat limit thermostat is no longer available for the OUH range of warm air heaters. Please use the replacement fan control/limit thermostat kit part No.73-65-006 (https://www.reznor.co.uk/product/retrofit-honeywell-fan-limit-thermostat-kit/).
What is the part number for the limit switch on the OUH Heaters?
Information about Reznor's range of cabinet heaters