3M Bair Hugger 675 - Fault and Error Conditions; Fault Conditions; Over-Temperature Condition; Under-Temperature Condition

English / 34-8720-2487-1 7
StandbyMode
The Standby mode is a temporary state that lasts a maximum of 10seconds and the
Bair Logo is displayed on the LCDscreen.
To enter Standby mode, press the Power button from Sleepmode.
To exit Standby mode, either: a) Press the Bair Logo for three seconds to enter
Diagnostic mode; or b) Wait 10seconds and the unit will go into Sleepmode.
SleepMode
During Sleep mode, the warming unit is idle and awaiting user activation. When in
Sleep mode the following eventsoccur:
• System timer remainsactive.
• The LCD goesblank.
• The Power indicator illuminatesamber.
To enter Sleep mode, press the Power button from either the Diagnostic mode or
Operationmode.
To exit Sleep mode, either: a) Press the Power to enter Standby mode; or, b) Press a
temperature button to enter Operationmode.
FaultConditions
The Model675warming unit’s software recognizes several nonhazardous fault
conditionsincluding:
• Sensorfailures.
• Microprocessorfailures.
• Softwarefailures.
• Keypadfailures.
• Power supplyfailure.
• Temperature out ofrange.
When a fault condition exists, the following eventsoccur:
• Blower turnsoff.
• Heater turnsoff.
• Audible alarmsounds.
• Fault wrench appears on LCDscreen.
• Fault code appears on LCDscreen.
• Up to 20fault codes are stored inmemory.
Silence Alarm/ResetUnit
• When the audible alarm sounds, press the Power button on the keypad to
silenceit.
• The warming unit must be unplugged before it can be used. See “Viewing the
Fault Code Log” and the “Fault Code Table” for more information about specific
faultcodes.
Over-TemperatureCondition
An independent electronic thermal cutoff safety circuit shuts the heater off to ensure
the hose end air remains below 56°C if an over-temperature condition is detected. An
over-temperature condition occurs when one of the following isdetected:
1. The independent thermal cutoff safety circuit senses the air exiting the unit
exceeds 53°C[±3°C].
2. The temperature exceeds 47°C for 30seconds.
3. The temperature is 3°C above set point for 3minutes.
When an over-temperature condition exists, the following eventsoccur:
• Over-temperature indicator and fault
condition wrench alternate displaying
in the LCDscreen.
• Audible alarmsounds.
• Blower and heater turnoff.
The warming unit must be unplugged before it can beused.
Under-TemperatureCondition
An under-temperature condition occurs when the warming unit detects the
temperature set point has not been reached or maintained during use. It occurs when
the temperature is less than 3°C below the selected temperature for 3minutes.
When an under-temperature condition exists, the following eventsoccur:
1. Under-temperature indicator and fault
condition wrench alternate displaying
in the LCDscreen.
2. Audible alarmsounds.
3. Blower and heater turnoff.
The warming unit must be unplugged before it can beused.
DiagnosticMode
The BairHugger Model675has a diagnostic mode that allows access to the service
and calibration utilities of the unit. You will need to access the diagnostic menu for
several service procedures described in thismanual.
To access Diagnostic mode, press and hold the Diagnostic Mode button (i.e. Bair
Logo) for three seconds. The Diagnostic Mode, Ambient, 32, 38, and Power buttons
are used to access Diagnostic mode, navigate through the Diagnostic Menu items, and
exit Diagnostic mode. The figure and accompanying table below show the front panel
button locations and functions used in Diagnosticmode.
DIAGNOSTICS MENU
FILTER TIMER
CALIBRATION
SYSTEM TEST
OT TEST
Scroll Up
Exit
Diagnostic
Mode
Select Menu
Item
Access Diagnostic
Mode/Main Menu
Scroll Down
Bair Hugger Button Functions in Diagnostic Mode
Button Action WhenPressed
Diagnostic
Mode
• Hold for 3seconds to access Diagnostic mode. The warming
unit must be in Standby mode or Fault mode to access
Diagnosticmode.
• When in any Diagnostic mode screen, press to go to the
DiagnosticMenu.
32 • Scroll down a Diagnostic Menuitem
38 • Scroll up a Diagnostic Menuitem
Ambient • Select a Diagnostic Menuitem.
Power
• Exit Diagnostic mode and return the warming unit to
Sleepmode.
The figure below illustrates the Diagnostic Mode menu structure and the associated
menuitems.
DIAGNOSTIC MENU
FILTER TIMER
CALIBRATION
SYSTEM TEST
OT TEST
SYSTEM INFO
FAULT LOG
BLOWER TIMER
43C
170W
340W
680W