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3. Solid Red Fill Light: indicates humidifier had a fill fault, humidifier is shut down. The humidifier will
try to fill for 50 minutes, if the high water pin has not been tripped or the humidifier has not
reached nominal amperage, the humidifier will shut off. 30 minutes into the fill fault (prior to
shutting off) the humidifier will rapidly cycle the fill and drain valves to try to dislodge any
sediment blocking the valves.
a. Verify saddle valve pierced the pipe header and is open.
b. Ensure yellow high water pin sensor wire is firmly installed on canister post and both
black electrode wires are installed and fully seated.
c. If all wires are attached, check operation of the fill valve. See the Verify Operation
section below.
d. Verify the steam hose does not have sags or low spots, water will condense and pool in
these areas causing backpressure which will cause the humidifier to fill due to low level in
the canister.
4. Flashing Red Service Light: indicates sensed amperage is 75% of the maximum amperage
recorded. The humidifier must operate for 168 hours (1 week) and have had its amperage drop to
75% of the maximum amperage recorded.
a. Verify amperage with a clamp on ammeter through multiple fill cycles. See Verify
Operation section below.
i. For 11.5 amp operation, humidifier will fluctuate between 10.3 and 12.7 amps.
ii. For 16.0 amp operation, humidifier will fluctuate between 14.4 and 17.6 amps.
b. If amperage is within the correct operating band, depress the On/Off button to shut the
humidifier down which will reset the PCB memory.
c. If amperage is below the correct operating band, depress the On/Off button to shut the
humidifier down allowing the humidifier to fully drain, and then replace the canister (Part
Number 80).
5. Solid Red Service Light, humidifier is shut down for overcurrent fault. This typically happens when
the canister or drain valve is plugged with minerals; the humidifier cannot maintain the proper
conductivity through drain operations.
a. Remove and rinse canister.
b. Clean sediment out of the drain valve.
c. Reinstall canister and start humidifier (see the Verify Operation section).
d. If red service light persists replace the canister (Part Number 80).
e. If humidifier cannot drain after cleaning drain valve, replace the drain valve (part number
4983).
6. Erratic light behavior (i.e. no lights while humidifier is on or multiple lights coming on at one time)
or humidifier shuts down for no reason; replace the membrane switch (Part Number 5532).
a. Verify steam hose fit on canister.
b. Check for evidence of leaks.
Verify operation:
1. Turn the humidifier off and allow it to fully drain before moving on, this will take about 5 minutes.
2. Remove canister door and electrical access panel.
3. Clip the ammeter on one electrode wire.
4. Remove the humidistat line and jumper across the two HUMIDISTAT terminals with an 18AWG
wire. Do not apply 24 volts to the humidistat terminals of the Model 800.
5. Use the small c-clamp to override the canister door safety switch.
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