Line Voltage And High Limit Eco Testing - Bradford White ERE240 Service Manual

Line Voltage Testing
1. Turn "OFF" the power to the water heater.
2. Remove access cover(s) from front of water
heater. This is done by sliding a flathead
screwdriver underneath the latch at the top
of the cover. Remove insulation and plastic
cover from the High Limit (ECO).
3. Set multi-meter to "Volts AC."
4. Turn power "ON" to water heater.
5. Check voltage across terminals 1& 3 of
the High Limit (ECO) (see Figure 2).
A) Rated voltage IS present, power to the water
heater is okay.
B) Rated voltage NOT present, Check circuit breaker
at service panel.
High Limit (ECO) Testing
1. Check voltage across terminals 1 & 4 of the High Limit (ECO) (see Figure 3).
A) Rated Voltage IS present, ECO is okay.
B) Rated voltage NOT present, proceed to step 2.
2. Turn power "OFF" to water heater and firmly press ECO reset button on the High Limit (ECO). Turn power "ON" and
recheck voltage across terminals 1 & 4 of the High Limit (ECO) (see Figure 3).
A) Rated Voltage IS present, the ECO has previously opened indicating the water in the tank,
at some point did overheat, review the steps in the 7 Flash Red Code section
B) Rated voltage NOT present, water in tank may be over heated.
1. If water is hot, turn "OFF" power to water heater and flow water through tank to cool below set point
of the High Limit (ECO). Recheck voltage per step 1.
2. If water is cool, Replace the High Limit (ECO).
SERVICE PROCEDURE
Line Voltage & High Limit
WARNING
High voltage exposure. Use caution when
making voltage checks to avoid personal injury.
Figure 2
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(ECO) Testing
Figure 3
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