Installation guide

1BHFt%3*45&&.7BQPSMPHJD 3 Installation and Operation Manual
t Tank level fault (Tank Level Flt) (previous name: Fill Time Flt)
The unit has run too long without the fill valve opening. Fill valve
may be stuck open, heating devices may be damaged, or heater
control may be faulty.
t Low level probe fault (LL Probe Fault)
The sensor has indicated that the water in the tank reached the
middle or top probe without reaching the lower probe.
t .JEMFWFMQSPCFGBVMU(ML Probe Fault)
The sensor has indicated that the water in the tank reached the
top probe without reaching the middle probe.
t Probe assembly fault (Probe Assy Fault)
The signal from the probes has deteriorated severely. Clean the
probes and tank; however, the probes may need replacing.
Humidifier faults
Below is a complete list of humidifier faults that can occur. (Your
system may not have all these options.) The text in parentheses is
the text that appears in the alarm log.
t Temperature sensor fault (Tank Temp Fault)
The temperature sensor on the humidifier tank is incorrectly
wired or defective.
t 5IFSNBMUSJQGBVMU5IFSNBM5SJQ
The tank temperature has exceeded 235 °F (113 °C).
t #PJMUJNFGBVMU#PJM5JNF'MU
The water in the tank failed to boil within the maximum boil
time.
t 4%6GBVMU4%6'BVMU
The SDU blower pressure switch failed to close when the SDU
started.
t 'MVFGBVMU'MVF'BVMU
The air damper limit switch and/or the power vent pressure
switch failed to close after the combustion air blowers started.
t #VSOFS</P>GBVMU#VSOFS</P>'BVMU
The burner failed to light after nine ignition attempts.
t *HOJUPS</P>GBVMU*HOJUPS</P>'BVMU
The ignition control module failed to energize the gas valve on
every ignition attempt.
t #MPXFS</P>GBVMU#MPXFS</P>'BVMU
The specified blower was unable to reach the desired speed.
t (BT7BMWF</P>GBVMU(BT7BMWF</P>'BVMU
The indicated gas valve is open and should not be.
Fault messages, continued
VL3_IOM.pdf 66 11/19/2009 9:11:15 AM