Installation guide
DRI-STEEM Vapor-logic
3
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Index to troubleshooting guide
Below is an index to possible control-related problems described on the following pages. To find solutions, refer to the
page number.
Description Page Description Page
General Operational problems
Green power indicator light is off 86 Control does not energize 92
No remote fault indication 86 Unit does not fill with water 93
No readable information on keypad/display 86 Fill valve does not close 94
Faults
Reduced or no output 95
Humidity transmitter fault 86 Fill valve cycles on and off frequently 95
Dew point transmitter fault 86
Heater burnout
96
VAV humidity transmitter fault 86
Noisy operation
96
Temp comp transmitter fault 86
Display completely black
96
Fill fault 87 Humidity below desired level 97
Drain fault
88 Humidity above set point 98
Tank level fault
88 Hunting (RH swings above and below set point) 98
Fill time fault
88 Tank does not heat up 99
Boil time fault 88 Unit does not perform automatic drain sequence 99
LL probe fault 89 Unit does not perform end-of-season drain 100
ML probe fault 89 Tank has proper water level and is always warm 100
Clean probes and tank message 90
Probe assembly fault 91
Tank temperature sensor fault 91
Thermal trip fault 91
SDU fault 91
Checksum failure 91
Flue fault 91
Gas valve [no.] fault 92
Burner [no.] fault 92
Ignitor [no.] fault 92
Blower [no.] fault 92
VL3_IOM.pdf 89 11/19/2009 9:11:16 AM