Storage Failure (Sf) Errors - Carrier 33CS Installation, Service, And Troubleshooting Instructions

STUCK GAS VALVE (SE13) — The Stuck Gas Valve se-
quence is used to allow the system to properly react to a
failure mode of the HVAC unit when the gas valve becomes
stuck in the open position. When this condition exists, the
unit is unable to shut off the heat. To minimize this problem,
the internal limit switch trips causing the indoor fan to turn
on and remain on until the gas is manually shut off and the
heat exchanger cools to normal temperatures.
Without this feature, a VVT system operating normally
would close each of its zone dampers as space conditions
warmed to set point. This causes the heated air to be recir-
culated back through the unit, further aggravating the over-
heating problem. This allows space temperatures in the building
to rise to higher than normal temperature levels. However,
this sequence reduces the temperature build-up in the unit
and keeps the heat exchanger operating within temperatures
to prevent failure.
During No System Mode — If the duct temperature rises to
greater than 175 F, the indoor fan is started. The fan will
remain on if that temperature does not drop below 150 F
after 3 minutes. The bypass damper will be closed, and all
zone dampers will open to their maximum position. A Stuck
Gas Valve alarm (SE13) will be initiated.
→
During a Cooling Mode —If the duct temperature does not
drop below 100 F within 10 minutes, the cooling mode will
be dropped for 10 minutes. The ''No System Mode'' logic
will test for this condition.
ERROR
SF01
SF02
SF03
SF04
SF05
SF06
SF07
SF08
SF09
SF10
SF11
SF12
SF13
SF14
SF15
SF16
SF17
SF18
SF28
SF30
SF32
SF33
SF34
SF35
SF36
SF37
SF38
SF39
SF40
SF41
SF44
SF45
SF46
SF47
SF48
SF50
→ Table 4 — Storage Failure (SF) Errors
INFORMATION AFFECTED
Occupied Cooling Set Point
Occupied Heating Set Point
Cooling Set Point Low Limit
Heating Set Point High Limit
Unoccupied Cooling Set Point
Unoccupied Heating Set Point
Rotating Display
Fahrenheit Temperature Display
Occupancy Period 1
Occupancy Period 2
Occupancy Period 3
Occupancy Period 4
Occupancy Period 5
Occupancy Period 6
Occupancy Period 7
Occupancy Period 8
Schedule Number
Override Time Limit
Fan Operation For Heat
Time Guard Between Modes
LAT Monitoring
First Stage Cooling Temperature Limit
Second Stage Cooling Temperature Limit
First Stage Heating Temperature Limit
Second Stage Heating Temperature Limit
Auxiliary Relay
Optimize Staging
Temperature Lockouts
Heating Lockout Set Point
Cooling Lockout Set Point
Minimum Heat Run Time
Pre-Occupancy Purge
Zone Temperature Sensor Calibration
Remote Room Sensor Calibration
Duct Temperature Sensor Calibration
Fan Status Switch
21
During a Heating Mode– No action is required in this mode.
The alarm can be cleared or erased from the system in 2
ways:
• Cycle power to the thermostat off, then on.
• Initiate a reset by switching the Unit Reset option to the
ON configuration (category 7, option 11).
Storage Failure (SF) Errors —
ror is an error that corresponds to invalid information.
When an SF Error occurs, the TEMP system thermostat
replaces the invalid data in memory with factory selected
default values and the invalid information is not used to de-
termine system mode.
To clear an SF Error, enter the correct data at the TEMP
system thermostat by reconfiguring the associated options.
See Table 4 for a description of Storage Failure Errors.
EXAMPLE OF CLEARING AN SF ERROR — The TEMP
system thermostat displays a SF39 error. Look up SF39 in
Table 4. The affected configuration is Temperature Lock-
outs. The default value is OFF. The desired setting is ON.
To clear the SF39 error manually, reconfigure the Tem-
perature Lockouts option. The SF39 error should be cleared.
NOTE: If the SF error cannot be cleared, replace the TEMP
system thermostat and configure the new thermostat to match
desired settings.
MTWTHF 6:00AM-6:00PM
A Storage Failure er-
DEFAULT VALUE(S)
72
68
68
73
80
65
OFF
ON
–
–
–
–
–
–
–
0
1
ON
OFF
ON
45
50
110
105
1
ON
OFF
60
40
30
OFF
Factory Calibrated
Factory Calibrated
Factory Calibrated
OFF
597