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Table 49-1:
Alarms menu
Alarm label Description
Does alarm
auto-clear?
Tank temp sensor failed Tank temp sensor has failed. No
RH signal out of range RH signal is out of range. Yes
Dew point sig. out of range Dew point signal is out of range. Yes
Demand signal Demand signal is out of range. Yes
Duct RH signal out of range Duct RH signal is out of range. Sensor my be faulty. Yes
Aux temp sens out of range Auxiliary temp sensor signal is out of range. Yes
Water probe miswired Water probe head is miswired or faulty. Yes
Faulty water probe Water probe readings are suspect, likely caused by scale on probe. No
Excess fill time Fill valve has been on too long during initial tank fill. Bottom probe is not in contact with water. Yes
Excess refill time Re-filling is taking too long. Top probe is not in contact with water. Yes
Tank not draining
Drain valve has been open for the prescribed amount of time based on the humidifier model, and water is still
touching the low water probe.
Yes
Tank overtemp
Fault occurs at boiling temperature plus 25 °F (13 °C). All units are put into a keep-cool state where fill and
drain cycles operate to keep tank cool.
First resolve any safety issues, then resolve whatever is causing the problem. Restart the controller, and clear
the alarm.
No
Excessive boil time
Humidifier continues to add water when there is no demand, signifying humidifier is continuing to make steam.
Humidifier is put into a keep-cool state where fill and drain cycles operate to keep tank water from boiling.
First resolve any safety issues, then resolve whatever is causing the problem. Restart the controller, and clear
the alarm.
Note: This alarm applies only to non-DI/RO-water humidifiers and DI/RO-water humidifiers with EOS drain.
No
No SDU airflow
Airflow proving switch in the SDU (space distribution unit, a fan-based dispersion assembly) indicates no
airflow. No steam is produced while alarm is active.
Yes
No power vent airflow Pressure switch indicates there is no airflow at the power venter. Yes
No combustion airflow Switch indicates the combustion air damper is closed. Yes
Blocked flue
(GTS systems only)
Flue pressure switch indicates positive pressure in flue. Burner will not ignite when this fault is active. Yes
Burner 1, 2, 3, or 4 fault
Burner tried one or more times to light and did not succeed. Once this fault is active, Vapor-logic4 locks out the
burner and does not try to light it again until fault is cleared. Other burners can run.
No
Ignition mod. 1, 2, 3, or 4 fault
Ignition module has not opened the gas valve. Once this fault is active, Vapor-logic4 locks out the ignition
module and does not try to start it again until fault is cleared. Other ignition modules can run.
No
Blower 1, 2, 3, or 4 fault Blower is turning at less than the specified minimum RPM. Unit not allowed to run. Yes
Gas valve 1, 2, 3, or 4 fault Gas valve is on when it should be off. Unit not allowed to run. Yes
Low water Low water probe is in contact with water and low water sensor is not in contact with water. Yes
XV header flooded (STS
systems only)
Float switch in Ultra-sorb Model XV header has detected a flooded header condition Yes
Continued
Operation
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