No Display on User Interface Module UIM

Fault Code Troubleshooting Guide

Power Anode Drive Voltage LT Tank Voltage (Powered anode circuit not working):

Anode shorted to tank or upper element-

•Check for short circuit-

1.Disconnect the red wire from the tab on the anode; use an Ohm meter to check between the wire tab on the anode and the tank. A low reading (should be ≥ 1 mega-ohm) indicates a short.

2.If short, take out the upper element and re-check; if no longer short, make sure the upper element is a folded type, maximum 10 inches long. Replace if wrong element.

3.If the short persists, the anode may be bent and touching the tank. Remove the anode, see “Powered Anode Troubleshooting” (p.27), and carefully straighten if bent.

4.Check the anode for a short by placing one Ohm meter probe on the steel nut, the other on the tab connector. If resistance is low reading (should be ≥ 1 mega-ohm), replace the anode.

Power Anode ADC Error (Powered anode circuit not working):

Faulty control board-

•Replace the control board.

•If replacing the control board doesn’t resolve the issue, contact technical support.

Power Anode No Tank Voltage (Powered anode circuit not working):

Anode shorted to ground-

•Anode may be shorted to tank or element. Check for short see “Powered Anode Flowchart” (p.29). Low water level-

•Check water level, ﬁll the tank if necessary.

Power Anode No Current Sense (Powered anode circuit not working):

Faulty control board-

•Replace the control board.

•If replacing the control board doesn’t resolve the issue, contact technical support.

Power Anode Wrong Voltage Feedback (Powered anode circuit not working):

Anode internally shorted, shorted to tank or upper element-

•Refer to “Powered Anode Flowchart” (p.29) Control board faulty

•If anode is not shorted in any way, replace control board.

No Display on User Interface Module (UIM):

Conﬁrm that there is no power to the unit-

Determine if UIM or control board is faulty-

•If the water heater heats water (compressor runs or elements turn on), troubleshoot the UIM

•If the water heater does not heat water, check LED201 on the control board. If lit, assume control board is good. Troubleshoot the UIM and ribbon cable.

•If not lit troubleshoot control board.

Troubleshoot UIM-

•Turn off power at the circuit breaker/fuse box

•Check for a loose connection of the ribbon cable at CN211 or CN215 on the control board.

•Check the cable connection on the UIM PCB

Troubleshoot control board-

•Check the fuses on the control board.

1.If good replace the control board. If replacing control board doesn’t resolve issue, call technical support.

2.If bad replace fuses and look for shorts to ground.

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