Likely causes: park brake signal missing, blown fuse, battery/ground issue, pump protection lockout, control panel communication fault.

1. Confirm the park brake is fully set. This is the single most common cause of a completely unresponsive system.
2. Check the ignition position. The touch panel should illuminate when the ignition is on.
3. Inspect the main fuses on the pump power unit. There are typically five plug-in fuses behind a cover on the power control box. Pull each one, check for continuity, and replace any blown fuses with the correct amperage.
4. Look for a tripped breaker on the chassis rail — there may be a relay on the driver or passenger side chassis rail that has tripped but isn’t obviously visible. Reset any tripped breakers.
5. Verify battery ground connections at the pump motor. HWH grounds the motor via its mounting to the reservoir — a poor ground causes the motor to fail to spin. Adding a dedicated 3-foot ground wire from a motor mounting bolt to a clean chassis ground resolves this permanently.
6. Unplug the touch panel, wait 2 minutes, and plug it back in. This clears communication faults between the touch panel and the I/O module.
7. If the pump protection lockout has engaged, turn ignition off, press CANCEL, and wait 30 seconds before retrying.

Likely causes: solenoid valve fault, wiring issue, debris or binding in the jack cylinder, low hydraulic fluid.

1. Check hydraulic fluid level first. Low fluid can cause one or more jacks to fail while others work normally.
2. Listen for the pump motor when you press AUTO LEVEL. If the pump runs but a specific jack doesn’t move, the issue is in that jack’s solenoid circuit rather than the pump.
3. Check the I/O module LEDs. The yellow LEDs (typically numbered 1–4 for each jack solenoid circuit) should illuminate when that circuit is active. If a LED is not lighting, trace the wiring from the module to the solenoid for that jack.
4. Test the solenoid manually. Some HWH solenoids have a small 1/4″ nut on the end cap that can be turned 4–5 turns to manually open the valve. Others have a T-handle or cam release. Do this only with the RV safely blocked.
5. Inspect the jack rod and cylinder for corrosion, debris, or physical obstruction. Lubricate the jack rod with a silicone-based lubricant.
6. Inspect all wiring for chafing, corrosion, or loose connectors. HWH systems use black wires throughout — probe with a voltmeter rather than relying on wire color.

Likely causes: solenoid fault, broken retract spring, wiring fault, loss of hydraulic pressure on power-retract systems.

1. On spring-retract (single-acting) systems, check that the retract spring in the jack cylinder is intact. A broken spring means the jack has no mechanical force to return upward when hydraulic pressure is released.
2. On double-acting (power-retract) systems, the retract solenoid circuit must be functional. Check the I/O module LEDs for retract solenoid activity.
3. Release the park brake with the ignition on — the system is designed to retract jacks automatically when drive is selected. If this forces the jacks up, you have a solenoid or wiring issue, not a mechanical one.
4. Manually open the retract solenoid at the manifold if you need to recover the coach. Refer to your system’s specific service manual for the correct manual override procedure.
5. Inspect the jack for physical binding — mud, rocks, or debris wedged around the jack rod can prevent retraction even when hydraulics are functioning correctly.

Likely causes: dirty or faulty level sensor, calibration drift, site slope beyond system range.

1. Clean the level sensors — dirty sensors are a surprisingly common cause of inaccurate auto-leveling. Use a dry cloth or compressed air; do not use solvents.
2. Verify the site slope is within the system’s operating range. If you’re on extreme terrain, use leveling blocks under the low-side tires before deploying jacks.
3. If the system consistently levels to the same incorrect position, the sensor may need recalibration. Consult your service manual for the zero-set calibration procedure — typically pressing STORE while on a known-level surface.
4. Check that the sensor mounting bracket hasn’t been knocked out of alignment. The sensor must be mounted parallel to the coach floor.
5. If a sensor has failed completely, the system may default to a fixed leveling sequence. Replace the faulty sensor and recalibrate.

Likely causes: loose fitting, worn jack cylinder seal, cracked hydraulic hose, manifold fitting failure.

1. Do not operate the system if a significant leak is present — low fluid can cause pump cavitation and damage.
2. Identify the leak source before adding fluid. Watch for drips at hose connections, fittings, and jack cylinder bases during a brief safe operation cycle.
3. Tighten any loose fittings. Many minor leaks are simply fittings that have vibrated open over time.
4. Inspect all hose runs for chafing against frame edges or heat sources. A worn hose must be replaced — do not attempt to patch hydraulic hose.
5. Jack cylinder seal failure (weeping oil from around the extended rod) requires cylinder seal replacement — contact a qualified technician or HWH for a seal kit.
6. Use only HWH-approved hydraulic fluid when topping up. Using the wrong fluid can damage seals.

The 725 touch panel uses LED indicator lights to communicate system status. Understanding what they mean is the fastest route to diagnosis.

1. Jacks down warning light on in travel mode: One or more jacks are not fully retracted. Check each jack physically and verify the jack-down warning switch (magnetic reed switch) is functioning. A bad magnet in the jack or a failed switch will leave this light on permanently.
2. No lights on touch panel with ignition on: Loss of power to the touch panel. Check the communication cable between the touch panel and I/O module, and verify the control circuit fuse.
3. Link lights on I/O module not illuminated: Communication failure between the touch panel and I/O module. Check the cable, connectors, and both devices for damage.
4. Pump runs continuously without reaching level: Either extreme slope, a jack unable to contact ground, or a failed 50 psi pressure switch on the manifold. This switch signals the I/O module that pressure is present before solenoids open.

The HWH controller can become confused if slides and jacks are operated simultaneously, or if the operating sequence is interrupted mid-cycle.

1. Do not panic — this is recoverable in most cases without any hardware failure.
2. Retract the slides first if they are extended. Close everything before attempting to operate jacks.
3. Turn off the ignition completely and leave the system fully powered down for at least 10–30 minutes (overnight if possible).
4. On restart, press CANCEL before attempting any operation to clear pending commands.
5. Resume with the correct sequence: jacks first, then slides. Do not combine operations.
6. If the shuttle valve has failed due to simultaneous operation, it will need professional replacement — the shuttle valve is located on the top of the hydraulic manifold.