Aprilaire 800 Series Troubleshooting Manual page 2

5. Steam – Solid Green, humidifier is operating with a call for humidity.
6. Steam – Solid Yellow, humidifier has been operating for 168 hours but has not reached full
capacity. See Using Lights to Troubleshoot section 2.
7. Drain – Solid Green, Humidifier is in a drain cycle or humidifier drained for end of season due to
no humidity call for 72 hours, light will stay on for 24 hours. Humidifier will resume normal
operation with a humidity call. Drain Valve is energized for 30 minute.
8. Drain – Flashing Green, Flashes for 15 seconds before humidifier goes into a 4 minute drain
cycle humidifier is filling with cold water during this time to cool the water in the canister.
9. Service – Flashing Red, Sensed amperage is 75% of the maximum amperage recorded. See
Using Lights to Troubleshoot section 4.
10. Service – Solid Red, humidifier is shut down for overcurrent fault. See Using Lights to
Troubleshoot section 5.
System Setup Verification:
1. Verify Humidifier is installed according to all relevant local codes.
2. Verify electrical power is supplied to the Humidifier from 120, 208 or 240VAC on a dedicated
breaker per local codes.
3. Verify water supply tubing is properly attached to a cold water pipe, not leaking, and saddle valve
has pierced the pipe and is open.
4. Verify humidifier control is installed and wired properly.
5. Verify Model 62 humidifier control is not in the Test Reset position or the OFF position.
NOTE: If a control other than the supplied Aprilaire Model 62 ADHC is used, verify it uses
a dry contact On/Off signal. Do not apply 24 volts to the humidistat terminals of the
Model 800.
6. Verify the canister is properly seated with the O-ring in its groove (no leaking or scale buildup at
the drain valve/canister junction).
7. Verify the steam hose slopes down and away from the duct toward the humidifier or a tee and
drain trap with no low spot or sags in the hose. A minimum slope of 2" per foot is recommended.
8. If drain tees and water traps are installed, verify water traps have proper air gap and are full of
clean water.
9. Verify hose clamps on steam hose at the canister and dispersion tube are tight by pulling lightly
on the steam hose.
10. Verify drain hose is properly attached with no kinks or obstructions.
11. If condensate pump is installed:
a. Verify discharge line installed per manufacturer's directions.
b. Verify condensate pump is rated for at least 140°F water.
c. Verify sump is clean and free of debris or hard water build up.
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