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for failure may be a faulty current sensor board, incorrect wir-
ing, or a damaged input on the MBB control board.
T610 (Economizer Actuator Out of Calibration)
A620 (Economizer 2 Actuator Out of Calibration)
T630 (Humidifier Actuator Out of Calibration)
A640 (Heating Coil Actuator Out of Calibration)
A650 (Bldg.Press. Actuator 1 Out of Calibration)
A660 (Bldg.Press. Actuator 2 Out of Calibration)
Each of the actuators must have a minimum control range to
operate. If the actuator, after a calibration, has not learned a
control range appropriate for the application, this alarm/alert
will be sent. No action will be taken on this error. Recovery is
automatic. Reason for failure may be an obstruction or stuck
linkage that prevents full range calibration.
T611 (Economizer Actuator Comm Failure)
A621 (Economizer 2 Actuator Comm Failure)
T631 (Humidifier Actuator Communication Failure)
A641 (Heating Coil Actuator Comm Fail)
A651 (Bldg.Press. Actuator 1 Comm Failure)
A661 (Bldg.Press. Actuator 2 Comm Failure)
Each of the actuators communicates over the local equipment
network (LEN). If this error occurs, then it is impossible to
control the actuator. Depending on the function of the actuator,
the control will shut down any process associated with this ac-
tuator. Recovery is automatic. Reason for failure may be incor-
rect wiring, incorrect serial number configuration, or damaged
RS-485 drivers on the LEN bus.
T612 (Economizer Actuator Control Range Increased)
T622 (Economizer 2 Actuator Control Range Increased)
T632 (Humidifier Actuator Control Range Increased)
T642 (Heat Coil Actuator Control Range Increased)
T652 (Bldg.Press. Act. 1 Control Range Increased)
T662 (Bldg.Press. Act. 2 Control Range Increased)
The actuators, once properly calibrated, learn their end stops for
movement. During normal operation, if the actuator perceives
that the actuator is able to go farther than its learned range of op-
eration, this error will be broadcast. Reason for failure may be a
slipping of the linkage and therefore this error may mean that the
actuator cannot perform its assigned function. Recovery requires
a fix of any slipped linkage and/or a re-calibration.
T613 (Econ Actuator Overload, Setpt Not Reached)
A623 (Econ2 Actuator Overload, Setpt Not Reached)
T633 (Humidifier Act Overload, Setpt Not Reached)
A643 (Ht Coil Act Ovrload, Setpt Pos Not Reached)
A653 (BP Act. 1 Overload, Setpnt Pos Not Reached)
A663 (BP Act. 2 Overload, Setpnt Pos Not Reached)
If an actuator is unable to achieve a commanded position with-
in a reasonable period of time, this alarm or alert will be broad-
cast. This may be an indication of a stuck actuator. No action is
taken. Recovery is automatic.
T614 (Economizer Actuator Hunting Excessively)
A624 (Economizer 2 Actuator Hunting Excessively)
T634 (Humidifier Actuator Hunting Excessively)
A644 (Heat Coil Actuator Hunting Excessively)
A654 (Bldg.Press. Actuator 1 Hunting Excessively)
A664 (Bldg.Press. Actuator 2 Hunting Excessively)
This alert occurs when the commanded actuator position is
changing too rapidly. Recovery is automatic.
T615 Econ 1 (Outside) Not Economizing When It Should
When the control detects a stuck actuator, it will compare the
stuck position to the command position to log additional alerts.
If the stuck position < commanded position the alert is set.
T616 Econ 1 (Outside) Economizing When It Should Not
When the control detects a stuck or jammed actuator, it will
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position > commanded position, the
alert is set.
T617 Econ 1 (Outside) Damper Stuck Or Jammed
The actuator is no longer moving and the actual position is
greater than or less than E.GAP% of the commanded position
for E.TMR seconds. Reset is automatic.
T625 Econ 2 (Return) Not Economizing When It Should
When the control detects a stuck actuator, it will compare the
stuck position to the command position to log additional alerts.
If the stuck position < commanded position the alert is set.
T626 Econ 2 (Return) Economizing When It Should Not
When the control detects a stuck or jammed actuator, it will
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position > commanded position, the
alert is set.
T627 Econ 2 (Return) Damper Stuck Or Jammed
The actuator is no longer moving and the actual position is
greater than or less than E.GAP% of the commanded position
for E.TMR seconds. Reset is automatic.
A700 (Air Temp Lvg Supply Fan Thermistor Failure)
The failure of this sensor will shut the system down and gener-
ate an alarm as this thermistor is a critical component to funda-
mental operation and diagnosis of the rooftop unit. Recovery is
automatic. Reason for failure may be incorrect wiring, a faulty
thermistor, or a damaged input on the MBB control board.
T701 (Staged Gas 1 Thermistor Failure)
T702 (Staged Gas 2 Thermistor Failure)
T703 (Staged Gas 3 Thermistor Failure)
If any of the staged gas thermistors (Temperatures
AIR.T
S.G.L1-3) fails, an alert will be generated and the remaining
thermistors will be averaged together (Temperatures
AIR.T
S.G.LS) without the failed thermistor. Recovery is auto-
matic. Reason for failure may be incorrect wiring, faulty therm-
istor, or a damaged input on the staged gas control board (SCB).
A704 (Staged Heat Lvg Air Temp Sum Total Failure)
If all three staged heat thermistors (Temperatures
AIR.T
S.G.L1,2,3) fail, staged heat will be shut down and this alarm
will be generated. Recovery is automatic. Reason for failure
may be faulty wiring, faulty thermistors, or damaged inputs on
the staged gas control board (SCB).
T705 (Limit Switch Thermistor Failure)
A failure of this thermistor (Temperatures
AIR.T
S.G.LM)
will cause an alert to occur and a disabling of the limit switch
monitoring function for the staged gas control board (SCB).
Recovery is automatic. Reason for failure may be faulty wir-
ing, a faulty thermistor, or a damaged input on the staged gas
control board (SCB).
A706 (Hydronic Evap Discharge Thermistor Failure)
If the unit is configured for hot water heating (hydronic), then
the unit has a thermistor (Temperatures
AIR.T
CCT) in-
stalled between the evaporator coil and the hot water coils that
functions as the evaporator discharge temperature thermistor
for cooling. If this thermistor fails, an alarm will be generated
and the system will be shut down. Recovery is automatic. Rea-
son for failure may be faulty wiring, a faulty thermistor, or a
damaged input on the EXB control board.
T707 (Digital Scroll Discharge Thermistor Failure)
If the RXB control board is not receiving a signal from the dis-
charge temperature thermistor, the alarm is generated. The
thermistor may be missing, disconnected, or a wire may be
broken.
The alert will be generated and the digital scroll capacity will
be locked at 50%. Reset is automatic.
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