Rheem Marathon Point-of-Use Series Use and Care Manual - Page 15

Maintenance ! CAUTION Tank MUST BE full of water before power is turned on. Heating element(s) WlLL BE DAMAGED if energized for even a short time while tank is dry. The water heater's warranty does not cover damage or failure resulting from operation with an empty or partially empty tank. (Reference is made to the limited warranty for complete terms and conditions.) 4. VACATION AND LONG TIME SHUTDOWN - If the water heater is installed where it could freeze (summer cabin, lake home, etc.) you must drain all water from it and the piping. If the tank is full of water and it freezes, the tank will break. Freeze damage is not covered by the warranty! DRAINING THE WATER HEATER - ! CAUTION Always shut off power to water heater before draining water. In order to drain water heater, turn off the power supply, then turn off cold water supply. Next, it is necessary to open a hot water faucet or lift the handle on the relief valve to allow air to the tank, and KEEP OPEN. Attach a garden hose to the drain valve on the water heater, and open the valve. Direct the stream of water to a drain where it will do no damage. (See Figure 16). ! DANGER The water drained from the tank may be hot enough to present a SCALD HAZARD and should be directed to a suitable drain to prevent injury or damage. Drain Valve Floor Drain (or other suitable drain) Garden Hose Figure 16 - Draining the Tank When preparing to place the water heater in service again, be sure to completely fill the tank with water before turning the power on. ! WARNING Tank MUST BE full of water before power is turned on. Heating element(s) WlLL BE DAMAGED if energized for even a short time while tank is dry. The water heater's warranty does not cover damage or failure resulting from operation with an empty or partially empty tank. (Reference is made to the limited warranty for complete terms and conditions.) After a very long shut-down period, the water heater's operation and controls should should be checked by a qualified service technician. ! WARNING If water heater has been subjected to flood, fire, or physical damage, turn off power and water to water heater. Do not operate the water heater again until it has been thoroughly checked by qualified service personnel. Trouble Shooting Guide NATURE OF TROUBLE POSSIBLE CAUSE SERVICE No Hot Water 1. Manual disconnect switch turned off 2. Improper Wiring 3. No Power - blown fuse or circuit breaker tripped a. Shorted wiring b. Circuit overloaded c. Improper wiring d. Grounded element or thermostat 4. Manual Reset High Limit Switch (ECO) open a. Thermostat(s) defective b. Thermostat out of calibration c. Heat build-up due to loose wires d. Defective High Limit Switch (ECO) Turn to ON ** Rewire per Wiring Diagram Replace fuse or reset breaker ** Replace or repair ** Provide adequate circuit or reduce load ** Rewire per diagram ** Replace Refer to "Operation Section" ** Replace ** Lower setting or replace ** Tighten wire connections ** Replace Not enough Hot Water 1. Heater undersized 2. Defective Element Reduce rate of hot water use ** Check amperage, replace element if low Water too hot or not hot enough 1. Thermostat setting too high or low 2. Thermostat out of calibration Change setting as required ** Replace (continued) ! CAUTION ** For your safety, DO NOT attempt repair of Electrical Wiring, Thermostat(s), Heating Elements or other Operating Controls. Refer repairs to qualified service personnel. 13