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High Limit Sensor for the heat exchanger combustion chamber for Mr. Heater and Heatstar Garage/Shop Heaters manufactured by Enerco.
4 Flashes= High limit Switch 60015 or Rollout switch 60022 is in the open condition.
These are
normal open switches and will opens on a High Temperature or Over temperature rise.
Check for adequate combustion air on the blower motor by cleaning out vacuum hose port with a small drill bit before manually resetting switch or replacing these switch.
