TROUBLE SHOOTING (Continued)
PROBLEM | CAUSE | SOLUTION | |||
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| 1) Blower will not run. |
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| A) “ON/OFF” control switch turned off. | Turn switch to the “ON” position. |
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| B) Blower unplugged. | Plug blower back into 115 Vac. outlet. |
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| C) No power at outlet. | Repair service to outlet. |
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| D) Thermostat defective. | Replace thermostat. |
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| E) Control harness defective. | Replace control harness. |
NOTENOUGH |
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| F) High limit control circuit open. | Replace ECO. | |
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| G) Blower motor defective. | Replace Blower Assembly. | ||
HOT WATER |
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| Thermostat problems. |
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| A) Thermostat set too low. | Set temperature control higher. |
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| B) Thermostat or ECO defective. | Replace thermostat or ECO as required. |
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| Others |
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| A) Heater undersized. | Reduce hot water use. |
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| B) Low gas pressure. | Contact dealer. |
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| C) Incoming water is unusually cold. | Allow more time for heater to reheat. |
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| D) Leaking hot water pipes or fixtures. | Have plumber check and repair leaks. |
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| A) Defective air flow restrictor. | Take unit out of service immediately, call an |
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| A.O. Smith service representative. |
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| B) Not enough dilution air to mix with | Proper dilution air must be provided for |
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| flue gases in inlet tee. | combustion and dilution of flue temp. |
VENT PIPE TOO HOT |
| Refer to “INSTALLATION” section. | |||
(ABOVE 170°F) |
| C) Dilution air too hot for mixing with | Supply air is too hot. Check for heat sources | ||
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| flue gases. | around intake terminal and blockage of |
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| dilution air leg. |
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| D) Wrong burner orifice. | Install correct orifice. |
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| A) Dirt in burner ports | Turn off heater and gas, clean burner head. |
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| B) Combustion air path restricted. | Check intake venting arrangements for |
YELLOW FLAME |
| obstructions. | |||
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| C) Not enough dilution air for proper | Check Intake venting arrangement for |
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| combustion. | obstructions. |
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| A) Water on the floor under heater. | See “CONDENSATION” section. |
CONDENSATION |
| B) Water dripping from pan. | Provide drip “TEE” to catch condensation, | ||
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| see Figure 1. |
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| Improperly sealed, hot or cold supply |
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| connections, relief valve, drain valve | Tighten threaded connections. |
WATER LEAKS | or thermostat threads. |
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| Leakage from other appliances or water | Inspect other appliances near water heater. |
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| lines. |
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| Condensation of flue products. | Refer to “CONDENSATION” section. |
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| Thermal expansion in closed water | Install thermal expansion tank (DO NOT plug |
LEAKING T&P | system. | T&P valve). | |||
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| Improperly seated valve. | Check relief valve for proper operation |
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| (DO NOT plug T&P valve). |
HOT WATER ODORS | High sulfate or mineral content in | Drain and flush heater thoroughly then refill. | |||
(Refer to CATHODIC | water supply. |
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PROTECTION) | Bacteria in water supply. | Chlorinate water supply. | |||
WATER TOO HOT | Thermostat set too high. | Refer to TEMPERATURE REGULATION. | |||
WATER HEATER SOUNDS | Condensation dripping on burner. | Refer to CONDENSATION above. | |||
| Sediment at bottom of heater tank. | Clean sediment from tank. Refer to DRAINING | |||
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| instruction in Maintenance section of manual. |
SOOTING | Improper combustion. | Refer to COMBUSTION AIR AND EXHAUST on | |||
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| page 6. |
HEATER LIGHTS BUT GOES | Outlet polarity is reversed. | Test polarity and correct. | |||
OUT IN |
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