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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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Error Messages
No Inlet Water P4
This error is displayed when the EHU does not detect water in the steam generator tank.
• Check F2 fill valve fuse
• Check fill valve and confirm there is no debris clogging the valve
• Confirm proper water pressure
• Confirm the drain valve is clear of any debris and not leaking water by
• Backpressure in cylinder not allowing water level to rise
After correcting the problem this error can be reset by cycling power to the EHU. If the problem was not corrected this error
will be displayed 8 minutes after detection.
Remote Information Board:
• General fault contact is on
• Maintenance contact is off
Drain Circuit P5
This error is displayed when the EHU detects a problem with the draining system.
• Check drain valve fuse F3. If fuse is bad replace fuse and drain valve.
• Check drain valve to ensure it is clear of all debris
• Check drain hoses and drain cup for any debris
• Clean steam generator tank
To reset this error cycle power to the EHU. If the problem is not fixed it will be redetected and the error message will
reappear.
Remote Information Board:
• General fault contact is on
• Maintenance contact is off
When tank electrode current gets too high the drain valves opens to lower tank water level and reduce tank current. If the current
continues to rise and exceeds the unit’s high current set point, a P8 error will occur. The high current set point is dependent on steam
capacity of the humidifier.
• Check the drain valve for proper operation.
• Check the drain valve, drain cup and hoses to ensure they are clear of debris.
• Clean steam generator tank
Clean Cy Drain Valve P8
