Professional Hvac Technician Troubleshooting - Honeywell TrueSTEAM Operating Manual

Operating Manual

Professional HVAC technician troubleshooting

About your new thermostat
TrueSTEAM has internal system diagnostics that monitor system operation and maintenance
schedules as well as system faults. If a system fault is detected, the system will attempt to
recover itself up to five times in a 24 hour period. If unable to recover in that time, the red Call
Service light will activate.
NOTE TO HOMEOWNERS:
back in to clear the fault codes. If the Call Service light turns back on within one day, contact
your professional HVAC installer to troubleshoot the device.
HVAC INSTALLINg TECHNICIANS:
has occurred from which the humidifier can not recover by itself. The table below shows the
possible faults, along with steps to fix TrueSTEAM.
To see which of these faults has occurred, pressing the Reset button when the red Call Service
light is on will identify the fault through a series of red light blinks. Pressing and holding the
Empty button will clear the service fault lights.
Some of these faults will cause TrueSTEAM to shut down and enter Service mode, and some
can be recovered if the fault condition no longer exists after 1 hour (as indicated in column 3).
After 5 retries within 24 hours of any individual shutdown fault, the unit will enter Service mode
and will not try to recover until the power has been cycled. The retry counter will reset every 24
hours on time if it has not reached the maximum of 5 retries. The control will return to Ready
mode after all the faults have been recovered.
No. of Fault Description
Red
Light
Blinks
1 Water/Heater tempera-
ture sensor failed.
2 Water sensors failed.
A
69-2035EFS—0
If the Call Service light is active, unplug and plug the TrueSTEAM
If the TrueSTEAM Call Service light is red, a system fault
Auto-
Recoverable?
Yes, system
will return to
"Ready" if
fault no longer
exists in 1
hour.
Yes, system
will return to
"Ready" if
fault no lon-
ger exists in
1 hour. Will
attempt to
reset itself 5
B
times in 24
hours.
M24901
Steps to Fix
To be Performed by Professional HVAC
Technician Only
• Unplug TrueSTEAM and remove cover.
• Check water sensor connection to
electronic board.
• Reattach cover and plug TrueSTEAM in.
• If fault reappears, press EMPTY button and
follow tank cleaning steps on pages 7–8.
• Reassemble tank and press the RESET
button.
• If fault returns, replace with applicable
wattage heating element.
• Unplug TrueSTEAM and remove cover.
• Disconnect water level sensor wiring,
remove screen and lift snap-hinge clamp.
Remove water sensor assembly.
• Clean water sensor probes using warm
soapy water so that the metal is exposed.
• Reassemble the sensor assembly in the
unit, reattach and secure cover.
• Plug unit back in and press the RESET
button.
• If fault reappears, replace water sensor
assembly.
2