American Water Heater (A)BCG38T500-8P manual Flashes, FLASHES Reversed polarity in power supply

TROUBLESHOOTING

3FLASHES

Blower prover (air pressure) switch failed to close its normally open contacts after blower (draft inducer) was energized. Blower will run indefinitely, waiting for the blower prover switch circuit to close.

1Check air pressure reading at blower prover switch sensing port on blower fan housing with manometer (digital preferred); blower must develop at least -2.85” W.C. (negative pressure) before blower prover switch contacts will close.

2Replace blower prover switch if pressure reading at the sensing port does drop to at least - 2.85” W.C. and contacts remain open.

3If pressure reading taken does not drop to at least - 2.85” W.C., check vent system for obstruction, debris, and excessive elbows. Ensure vent system complies with manufacturer’s and NFGC venting requirements for fan assisted Category I appliances.

4Ensure there is neither a negative or positive air pressure in the equipment room (open doors to outdoor atmosphere). This can cause the blower prover switch to malfunction. Alleviate air pressure imbalance between the equipment room and the outside atmosphere.

5Check the condition of the blower wheel in the blower; clean or replace as necessary.

4FLASHES

ECO cutout (Energy Cut Off). Tank temperature has risen above 203°F and caused lockout. ECO status LED on integrated control will also be illuminated. See Figure 17.

1Determine if tank temperature is excessive and, if so, the possible cause (i.e., temperature control failing to cut out at set-point).

2Cool tank to below 120°F to reset. ECO reset status LED will illuminate on the integrated control when the control can be reset. Push reset button on integrated control. See Figure 17.

3Check continuity/resistance of temperature probes; clean off calcium build up.

6FLASHES

Reversed polarity in power supply.

1Interchange “hot” and “neutral” wire connections to the water heater.

7FLASHES

Flame sensing is marginal; flame sense signal is below 2.0 micro-amps.Water heater will continue to fire with flame sensing current over 0.1 micro-amp; below this, the control will close the gas valve and ignition failure will occur.

1Check flame sense rod alignment.

2Clean flame sense rod with steel wool.

3Check ceramic insulator on igniter/flame sensor for cracks. Replace if damaged.

Servicing should only be performed by a Qualified Service Agent

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