Troubleshooting the E-15 (A-P) Drain Valve Not Closing/Opening Error Code

Overview

The E-15 series fault codes indicate a problem with the drain valve actuator, drain valve assembly, wiring, microswitch, or OMS (Operation Management System) board.

These faults occur when the OMS Board does not detect the expected current draw or operating status from the drain valve actuator during an open or close command.

Critical Faults

• E-15 A – No current draw when attempting to close the drain valve.

• E-15 B – Excessive current draw while closing the drain valve.

• E-15 C – OMS does not detect actuator current when the drain valve is in the closed state.

Non-Critical Faults

• E-15 D OMS – No current draw when attempting to open the drain valve.

• E-15 E OMS – Excessive current draw while opening the drain valve.

• E-15 P OMS – OMS does not detect actuator current when the drain valve is in the open state.

Expected actuator voltage: 24 VDC

Call Avoidance

Before dispatching a technician, perform the following checks remotely or ask the customer to perform them if safe to do so:

1. Power cycle the equipment and clear the fault.

2. Run a drain valve open/close cycle and verify whether the fault returns.

3. Check for visible obstructions around the drain valve.

4. Verify that all external connectors are fully seated.

5. Listen for actuator movement when the drain valve is commanded to open or close.

6. Confirm whether the drain valve appears physically open or closed.

7. If the fault clears and the valve operates normally, continue monitoring operation. If the fault returns, proceed with field troubleshooting.

Field Troubleshooting

Recommended Parts

Replace parts only after troubleshooting confirms they are faulty.

• Drain valve

• Drain valve actuator motor

• OMS control board

Recommended Tools

• Digital multimeter

• Basic hand tools (screwdrivers, nut drivers, etc.)

Troubleshooting Steps

E-15A – No Current Draw While Closing (Critical)

OMS commands the drain valve to close, but no actuator current is detected.

1. Inspect wiring and connectors between the OMS board and actuator motor.

   • If loose, damaged, or disconnected, repair and retest.

   • If wiring is good, go to Step 2.

2. Command the valve to close and measure voltage at the actuator motor.

   Voltage should be 24 VDC

   • If 24 VDC is present, go to Step 3.

   • If 24 VDC is not present, go to Step 5.

3. Check actuator microswitch adjustment.

   • If adjustment is incorrect, adjust and retest.

   • If adjustment is correct, go to Step 4.

4. Replace the actuator motor.

   • If the fault is cleared, return the unit to service.

   • If the fault remains, go to Step 5.

5. Replace the OMS control board.

E-15B – Excessive Current Draw While Closing (Critical)

Actuator current exceeds normal limits during valve closing.

1. Inspect the drain valve for debris, scale, or mechanical obstruction.

   • If an obstruction is found, remove it and retest.

   • If no obstruction is found, go to Step 2.

2. Disconnect the actuator from the drain valve.

   • Command the actuator to cycle closed.

   • If the fault does not reappear, go to Step 3.

   • If the fault reappears, go to Step 4.

3. Replace the drain valve assembly.

4. Replace the actuator motor.

E-15C – OMS Not Detecting Current in Closed State (Critical)

Drain valve appears closed, but OMS does not detect the expected actuator status.

1. Verify that the drain valve is fully closed.

   • If not closed, repair the valve condition and retest.

   • If closed, go to Step 2.

2. Command the valve to close and measure actuator voltage.

   Voltage should be 24 VDC

   • If voltage is present, go to Step 3.

   • If voltage is not present, go to Step 6.

3. Check actuator microswitch adjustment.

   • If adjustment is incorrect, adjust and retest.

   • If adjustment is correct, go to Step 4.

4. Inspect all wiring and connectors.

   • If loose, damaged, or corroded, repair and retest.

   • If wiring is good, go to Step 5.

5. Replace the actuator motor.

   • If the fault remains, go to Step 6.

6. Replace the OMS control board.

E-15D OMS – No Current Draw While Opening (Non-Critical)

OMS commands the drain valve to open, but no actuator current is detected.

1. Inspect wiring and connectors between the OMS and actuator.

   • If a problem is found, repair and retest.

   • If wiring is good, go to Step 2.

2. Command the valve to open and measure actuator voltage.

   Voltage should be 24 VDC

   • If voltage is present, go to Step 3.

   • If voltage is not present, go to Step 4.

3. Check actuator microswitch adjustment.

   • If adjustment is incorrect, adjust and retest.

   • If adjustment is correct, replace the actuator.

4. Replace the OMS control board.

E-15E OMS – Excessive Current Draw While Opening (Non-Critical)

Actuator current exceeds normal limits during valve opening.

1. Disconnect the actuator motor from the drain valve.

   • Command the actuator to cycle open.

   • If the fault no longer occurs, go to Step 2.

   • If the fault remains, go to Step 3.

2. Replace the drain valve assembly.

3. Replace the actuator motor.

E-15P OMS – OMS Not Detecting Current in Open State (Non-Critical)

Drain valve appears open, but OMS does not detect the expected actuator status.

1. Verify that the drain valve is fully open.

   • If not open, repair the valve condition and retest.

   • If open, go to Step 2.

2. Command the valve to open and measure actuator voltage.

   Voltage should be 24 VDC

   • If voltage is present, go to Step 3.

   • If voltage is not present, go to Step 6.

3. Check actuator microswitch adjustment.

   • If adjustment is incorrect, adjust and retest.

   • If adjustment is correct, go to Step 4.

4. Inspect all wiring and connectors.

   • If loose, damaged, or corroded, repair and retest.

   • If wiring is good, go to Step 5.

5. Replace the actuator motor.

   • If the fault remains, go to Step 6.

6. Replace the OMS control board.

Other Possibilities

The following uncommon conditions may cause E-15 faults:

• Intermittent wiring faults that only occur during machine vibration or movement.

  • Inspect harnesses for pinched, stretched, or rubbed-through wires.

• Corroded electrical connectors causing inaccurate current sensing.

  • Clean or replace affected connectors.

• Drain valve contamination from debris, or foreign material.

  • Clean or replace the valve assembly as required.

• Improper microswitch adjustment after previous service work.

  • Verify adjustment according to manufacturer specifications.

• OMS current-sensing circuit failure that intermittently reports false drain valve faults.

  • Replace the OMS board after all actuator, valve, and wiring checks have passed.