Honeywell TrueSTEAM HM612A1000/U Installation Manual page 54

No. of Fault Description
Service LED
Blinks
4 Heating element
overheated.
5 Input voltage
insufficient.
6 Water overflow
sensed.
52
Auto-Recoverable? Steps to Fix
(Performed Only By Professional HVAC Technician)
No
If this is a new install:
1. Reset the error code and power cycle the unit.
2. If the error code comes back, replace the unit.
If this is NOT a new install:
1. Troubleshoot the water sensor
2. If troubleshooting indicates a sensor issue, replace the sensor.
3. If that does not resolve the issue the entire unit will need to be
replaced.
Yes, system will 1. Verify the electrical circuit is not overloaded.
return to "Ready" 2. Unplug and replug steam humidifier in to see if the fault
if fault no longer returns.
exists in one hour. 3. If the fault returns, unplug steam humidifier and remove cover.
4. Ensure wiring connections are secure and attached.
5. If the fault returns, replace steam humidifier.
Yes, system will
Overflow error code is usually caused by one of three things:
return to "Ready" 1. Back pressure on the nozzle or remote hose.
if fault no longer 2. Back pressure on the drain tube.
exists in one hour. 3. Low/High level probe corrosion
Ensure that static duct pressure is not above .5" wc.
If this is a remote install:
1. Make sure the remote hose has a minimum rise of 2" per foot,
straight downhill pitch, since even any bend can contribute to
back pressure.
2. Ensure that remote hose rises 6" from the steam humidifier
before it angles to the remote mount location.
3. Ensure that the remote nozzle is not pointing in to the airflow.
Drain Tube:
1. Ensure drain hose has a steady downhill pitch with no flat or
uphill areas.
2. Ensure drain hose is not kinked or submerged in water at the
drain.
3. Check functionality of condensate pump, if used.
If the above does not resolve the issue:
1. Unplug steam humidifier.
2. Loosen cover screw and remove cover.
3. Remove water sensor assembly.
4. Clean sensor probe assembly. May use wire brush to clean
metal for water level reading.
5. Press button to reset unit.
Steam Humidifier System 69-2285—11