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The diagnostic mode will display the message C04 and the fill solenoid is blocked. C05: DRAIN SYSTEM FAILURE: This routine checks for a failure to reduce current if the drain valve is energized for more than five seconds. If the actual current does not decrease when the microcontroller demands a drain cycle, the unit will go into a diagnostic routine. This routine will try twice to correct the drain system failure by cycling the drain valve rapidly. If the failure is not corrected, the unit will shut down. The tank off indicator will light, the numerical display will show C05 (the drain valve failure message), and the dry contact will close to activate the remote alarm. Drain system failure can be due to a plugged drain valve, drain valve solenoid failure, scale buildup in the tank, or drain piping problems. Refer to the maintenance section of this manual for resolution of these problems. C06: FILL SYSTEM FAILURE: After start-up, if the fill valve is on and has been on for more than four minutes, the diagnostic routine will check the fill valve operation. If the actual amp signal is less than the current when the fill valve was opened, the unit will go into a diagnostic routine. If the problem cannot be corrected, a fill system failure will be triggered and the unit shut down. The three digit display will show C06 to indicate this condition, and the dry contact will close to activate the remote alarm. Fill system failure can be due to excessive or insufficient inlet water pressure, a failed fill valve solenoid, a plugged fill valve failed open, or a backflow preventer. Refer to the maintenance section of this manual for resolution of these problems. C07: OVERCURRENT FAILURE: The overcurrent limit (OCL) is 20% above the nominal amp rating of the unit. When the actual current reaches the OCL, the microcontroller will de-energize the contactor and energize the drain valve for 15 seconds. Then the contactor will be re-energized to see if the drain valve has corrected the overcurrent condition. This procedure is repeated 5 times. If the overcurrent still exists, an overcurrent failure indication of C07 is displayed, the unit is shut down, and the dry contact will close to activate the remote alarm. The unit will have to be manually reset and the overcurrent condition addressed by the maintenance personnel. An overcurrent failure can result from the cold startup of a tank that was previously running at a high load, resulting in the tank water becoming too conductive for start-up. If this is suspected, manually drain the tank for 15-30 seconds, then try to restart the system. If the overcurrent failure repeats, the drain system could be partially plugged, or the tank may be in need of cleaning. Refer to the maintenance section of this manual for resolutions to these problems. C08: MANUAL TANK SHUT-OFF: The tank on/off button will de-energize the tank contactor. The tank off light and the diagnostics indicator will be on and the display will show the message C08. The unit will stay in this condition until the button is pressed again. In the tank off mode, the manual drain button is still active, but the mode select button is not. 21 C09: I/O DIAGNOSTICS If the display mode selection is left in the diagnostic mode for 10 seconds, the Input/Output circuit diagnostic check will begin. The display will show the message C09, the tank will be off, and the diagnostics mode light will remain on. Output Circuits: The diagnostics will first check all the output circuits: fill valve, drain valve, and tank contactor to make sure they are working. When a light comes on, you will hear the corresponding valve or contactor circuit energize for about 2 seconds. Each circuit is checked twice before proceeding to the next circuit. Input Circuits: Next the microcontroller checks the status of all input circuits, beginning with the control stat. the 3 digit display will show 0% Demand, then the actual stat demand. It will do this twice. The input diagnostics continues by checking the fan interlock switch, high limit duct humidistat, and high water switch. The display will now show C09 followed by any additional messages that indicate problems with the input circuits. When the I/O diagnostic check is finished, the demand mode light will be on, the display will show the control stat demand and the unit will return to normal operation. The complete I/O diagnostic check lasts less than 2 minutes. 22 WATER QUALITY AND TREATMENT FOR EHU SERIES HUMIDIFIERS GENERAL Series EHU 700 electronic humidifiers use ordinary tap water in their operation. The quality of this water affects both the operation and the maintenance of the humidifier. How the EHU works: The EHU is an electrode boiler. When no water is present, the electrodes are separated by air, an insulator, so no current flows. When tap water contacts the electrodes it conducts current between the electrodes, heating the water. How much current passes between the electrodes is dependent on ...

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