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clean, soft cloth. Not required, permanently lubricated. 10 TROUBLESHOOTING WARNING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Only a qualified service person should service and repair heater. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Motor does not start when heater is plugged in and thermostat setting is higher than surrounding air temperature. 1. No power or low voltage at heater due to: A) Damaged power cord or extension cord B)