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TrueSTEAM™ Humidification Systems
Module 7: Maintenance and Service
Module 7: Maintenance and Service
• Maintenance
- Understanding cleaning cycles
- How to manually clean TrueSTEAM
- How to replace the water filter
• Service
- How to identify fault root causes
- How to fix faults
Cleaning Cycles
• Designed to dilute the concentration
of water hardness in the TrueSTEAM
tank
• Automatic cleaning cycles
- Remove concentration of dissolved
minerals still in the water, which slows the
accumulation of solid mineral scale and
sediment
• Manual cleaning cycles
- Remove concentration of dissolved
minerals
- Allows user to clean out solid mineral
scale and sediment
Manual Cleaning Step 1: Indication
• PRES
• S EMPTY blinks to indicate manual
cleaning is required
- Note, TrueSTEAM will still operate even when this
light is blinking
• Press and hold the EMPTY button until
the CLEAN TANK light begins blinking
- This indicates a flushing cycle has initiated
• When CLEAN TANK is on solid
- Flushing cycle is complete and tank is empty
- The tank is now safe to remove
Manual Cleaning Step 2: Tank Removal
• Turn red handle counterclockwise to “Unlock’
position
• Release solenoid by
pushing back on grip
• Grip tank bottom
• With other hand, press down cover
handle release, and pull handle
forward
Manual Cleaning Step 3: Cleaning
• Tank cleaning
- Use tap water to flush loose
1.
sediment from tank
- Apply cleaning agent (list below)
to cloth or paper and scrub
residual scale from tank walls
- Screen is removable for cleaning
- Tank is dishwasher safe
- Recommended cleaning agents




CLR
Lime-Away
White Vinegar
Do not use hydrocarbon oil based
• Element cleaning
- Apply cleaning agent and let soak
for 10 minutes
- Carefully rub scale off with cloth
or paper
2.
Manual Cleaning Step 4: Reconnect Tank
• Ensure sensor
compartment fill
holes are clear of
debris.
• Ensure gasket is
properly seated in
chassis before
reconnecting tank.
Manual Cleaning Step 4: Re-Engage Tank
• Attach the tank by securing
the latch.
• Engage the white water valve
to the tank’s black spool,
then turn the manual shut-off
valve to the “Lock” position
and plug in the power cord.
• Check that TrueSTEAM is
still mounted level and is
securely in place on the
mounting bracket.
1.
3.
2.
Changing the Water Filter
• Replace the inline filter at least per
season:
- Turn the water supply off at the saddle valve
or T-fitting.
- Press down filter collar ring and pull out ¼”
water line from each side.
- Insert the ¼” lines into new filter. Apply
modest pull to ensure a tight fit.
- Secure the new filter in place.
Inspect Water Level Sensor
CAUTION: Electrocution hazard.
TrueSTEAM must be unplugged
before removing the cover.
• Remove T20
Torx screw,
then slide cover
out front.
• Remove T30
Torx screw and
lift hinge and
remove sensor
assembly for
inspection.
- If excessive debris is present, replace
sensor pack:
• Replacement sensor part #50027998-001
• Also available bundled with water filter #50042822-001
Final Maintenance Steps
• Clear duct from ventilation holes and
debris from drain tube.
• After cleaning, initiate a humidity
call and check that there are no water
or steam leaks on TrueSTEAM or the
water lines.
• While on vacation, it is
recommended you turn the humidity
control to ‘off’.
• TrueSTEAM will drain and remain
empty after 48 hours without a
humidity call.
Service and Diagnostics
Service Interface
• Call Service Light on indicates a fault
detected
• Press and hold ‘Reset’ until Call Service
light blinks
- Refer to troubleshooting guide for fault details
• Basic, categorized descriptions and
quick-fix steps provided in following
slides
• Refer to installation guide’s
troubleshooting section for more detail
Faults Related to the Heating Element
# of
blinks
Description
Possible part(s)
affected
Possible root cause and quick fix suggestions
1
Temperature
sensor
overheated
• Thermistor within
heating element
This fault indicates the temperature sensor itself has
shorted. Attempt to clear the fault by pressing and
holding the Reset or Go button. If the fault persists, the
TrueSTEAM will need to be replaced.
4
Element
overheated
• Scale on the
heating element
Likely caused by scaling on the heating element.
Manually clean the element and replace the water filter.
After cleaning, ensure DIPs 1-2 are set for either 5-hour
or 8-hour flush intervals.
8-11
Element relay
failed
• Relays within the
heating element
Attempt to clear the fault by pressing and holding in the
“Reset’ or ‘Go’ button (depending on the model you
have). If the fault returns, the heating element has faulted
and the TrueSTEAM unit will need to be replaced.
14
Element failed to
boil water
• Scale/sediment in
tank
• Solenoid valve
What may have happened is debris has stuck the
solenoid valve open, allowing cool water to continuously
enter tank as it attempts to boil. Likely caused by
excessive scale/sediment. Manually clean the tank and
replace the water filter. With the water tank removed,
inspect the solenoid orifice and clear debris if present.
After cleaning, ensure DIPs 1-2 are set for either 5-hour
or 8-hour flush intervals.
Note: Should any fault persist after performing quick fixes below,
refer to manual’s troubleshooting section for more detailed next
steps.
Faults Related to Water Delivery/Monitoring
# of
blinks
Description
Possible part(s) affected
Possible root cause and quick fix suggestions
2
Water sensors
failed
• Water level sensor
assembly
Likely caused by scaling on the sensor assembly
contacts. Follow steps to inspect sensor assembly.
Replace if excessive scaling is present.
3
Failed to fill
• Saddle/shutoff supply
valve
• Solenoid valve
Ensure the water supply is fully open, and that water
pressure is above 30 psi. Also ensure no kinks or leaks
exist in the water lines.
6
Water overflow
detected
• Water level sensor
assembly
• Scale/sediment in tank
If TrueSTEAM is remotely installed, then back-pressures
in the remote hose pushing steam back into the tank may
be a cause. Ensure accurate remote hose installation.
Excessive water hardness may also cause water frothing
that bubbles into the overflow chamber. Manually clean
TrueSTEAM and replace water filter. After cleaning,
ensure DIPs 1-2 are set for either 5-hour or 8-hour flush
intervals.
13
Failed to drain
• Solenoid valve
• Scale/sediment in tank
Likely caused by excessive scale/sediment. Manually
clean the tank and replace the water filter. After cleaning,
ensure DIPs 1-2 are set for either 5-hour or 8-hour flush
intervals.
• Scale/sediment in tank
Likely caused by excessive scale/sediment. Manually
clean the tank and replace the water filter. After cleaning,
ensure DIPs 1-2 are set for either 5-hour or 8-hour flush
intervals.
Note: Should any fault persist after performing quick fixes below,
refer to manual’s troubleshooting section for more detailed next
steps.
Blinking ‘Press Empty’ or
‘Cleaning Required’ light
Faults Related to Circuitry/Wiring
# of
blinks
Description
Possible part(s) affected
Possible root cause and quick fix suggestions
5
Input voltage
insufficient
• Home’s power supply
Verify the power circuit is not overloaded, and that the power
outlet meets amp capacity requirements of your TrueSTEAM
model. NOTE: Requires interaction with home’s line voltage.
Must be qualified to handle line-voltage.
7
HVAC power
not present
• TrueSTEAM DIP 4
If DIP 4 is down, then TrueSTEAM’s R and C terminals must
be wired to an external transformer (either the HVAC system’s
or a separate transformer controlling a remote fan). With DIP
4 down, TrueSTEAM is trying to verify that power is present at
the transformer before allowing humidity.
12
Circuit board
overheated
• Location of TrueSTEAM
installation.
Ensure TrueSTEAM is installed in a location with
temperatures within range of 34F to 104F. If outside this
range, TrueSTEAM will fault. Also ensure the ventilation holes
of TrueSTEAM’s cover is clear of debris to ensure proper air
movement, and that TrueSTEAM is not in a completely
enclosed space such as within a sealed cabinet. Ensure
proper ventilation to ensure TrueSTEAM performance.
15
No airflow
sensed
•TrueSTEAM DIP 5
If DIP 5 is up, TrueSTEAM’s R and C terminals must be wired
in-line with an air proving device to the system transformer.
With DIP 5 up, TrueSTEAM is trying to verify air movement
via an external proving device before allowing humidity.
17-18
Wireless
communication
overloaded or
lost
• RedLINK wireless adaptor
and TrueSTEAM ABCD
terminal
• TrueSTEAM DIP 3 and 4
Ensure the adaptor’s ABCD terminals are appropriately
connected to TrueSTEAM’s ABCD terminals.
Also ensure TrueSTEAM’s DIP 3 and 4 are up.
Next try reestablishing wireless connection between control
and humidifier.
Note: Should any fault persist after performing quick fixes below,
refer to manual’s troubleshooting section for more detailed next
steps.
Support Materials
• Detailed Training Materials on the TrueSTEAM User
Interface Available!
- Visit www.forwardthinking.honeywell.com
- Enter literature form:
 #69-2285: TrueSTEAM Installation Manual
Module 7: Summary
• Maintenance
- Understanding cleaning cycles
- How to manually clean TrueSTEAM
- How to replace the water filter
• Service
- How to identify fault root causes
- How to fix faults