American Water Heater (A)BCG38T500-8P Water Heater User Manual


 
24
Servicing should only be performed by a Quali ed Service Agent
TROUBLESHOOTING
3 FLASHES
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.
1 Check 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.
2 Replace blower prover switch if pressure reading at the sensing port does drop to at
least - 2.85” W.C. and contacts remain open.
3 If 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.
4 Ensure 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.
5 Check the condition of the blower wheel in the blower; clean or replace as necessary.
4 FLASHES
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.
1 Determine if tank temperature is excessive and, if so, the possible cause (i.e.,
temperature control failing to cut out at set-point).
2 Cool 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.
3 Check continuity/resistance of temperature probes; clean off calcium build up.
6 FLASHES
Reversed polarity in power supply.
1 Interchange “hot” and “neutral” wire connections to the water heater.
7 FLASHES
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.
1 Check flame sense rod alignment.
2 Clean flame sense rod with steel wool.
3 Check ceramic insulator on igniter/flame sensor for cracks. Replace if damaged.