Troubleshooting - Braeburn Builder 1200NC Instructions Manual

5
Additional Operation Features
Compressor Protection Feature
This thermostat includes an automatic compressor protection feature to avoid
potential damage to the system from short cycling. This thermostat automatically
provides a 5-minute delay after turning off the cooling system output to protect
the compressor. This protection is also present in the heat mode of operation on
heat pump systems to protect the compressor.
NOTE: The installer can bypass the compressor protection feature by pressing
the RESET button. This will erase all user program settings, returning all settings
to their default values. This should only be used during installation for testing
purposes or to reset a thermostat to regain normal operation.
Low Battery Detection and Replacement
This thermostat requires two (2) properly installed "AA" alkaline batteries to
provide power for the thermostat if 24 volt AC power is not connected to the
terminal block. This thermostat is equipped with a unique, three level low
battery detection feature that constantly monitors the batteries during normal
operating mode to determine whether they have sufficient power to provide
proper operation.
When this feature determines that the battery status is low, a low battery
indicator will appear in the display. After 30 days the battery indicator will
start to flash, and after 60 days the battery indicator will begin to flash faster,
indicating that the batteries need to be replaced immediately to maintain
system operation and program settings.
Replacing the Batteries
1. Open front cover and locate the battery compartment door.
2. Gently remove the two "AA" alkaline batteries located in
the battery compartment.
3. Install two new "AA" alkaline batteries into battery
compartment. Make sure to match the positive (+) ends
of the batteries with the positive (+) terminals located in
the battery compartment.
4. Close battery compartment. The low battery indicator should not appear
in display.
Non-Volatile Memory
In the event of a power failure, the Non-Volatile Memory feature allows all
settings to be recovered, eliminating the need to reset temperature and
differential settings. When AC power is restored after an outage or batteries
are reinserted, all settings are retrieved from memory and reinstated.
Status Indicators (Model 1200 and 1200NC Only)
There is one status indicator that can be displayed to notify
you of key system information.
AUX: This will turn on when the auxiliary second stage of
heating is active. The auxiliary stage of heating is usually
the least economical stage of heat.
cont.
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Troubleshooting

Symptom: Thermostat does not turn on heating or cooling system.
Potential Solution: Check to see if OFF is shown in display. This indicates that the
system is turned off at the thermostat. Move system selector switch to HEAT or COOL
position. After the compressor short cycle protection 5-minute period expires, the
system should start.
Compressor protection feature may be in effect due to compressor short cycle
conditions. See Section 5.
Heating or cooling system may be malfunctioning. Call a professional service technician
immediately to verify system operation.
Symptom: Thermostat turns on heating instead of cooling, or cooling instead of heating.
Potential Solution: Check thermostat wiring to make sure the heating and cooling
stages are connected to the correct terminals on the wiring block. See Section 7.
Symptom: Thermostat turns heating or cooling system on too often or not often enough.
Potential Solution: Increase or decrease temperature differential settings as appropriate
to provide the desired performance level. See Section 4.
Symptom: Low battery indicator is blinking in thermostat display.
Potential Solution: Replace batteries immediately to maintain proper system operation.
See Section 5.
Symptom: OFF is shown in thermostat display and heating or
cooling system will not start.
Potential Solution: This indicates that the system is turned off
at the thermostat. The thermostat must be in HEAT or COOL
mode of operation to control the heating or cooling system.
Move the system selector switch to the HEAT or COOL position.
Symptom: Thermostat display is blank.
Potential Solution: It is possible that AC power is not present at the thermostat, and/or
the batteries are drained. Check fuse, circuit breaker and thermostat wiring as
appropriate to verify AC power is available. Replace batteries before reprogramming
thermostat. See Section 5. If AC power is present, call a professional service technician
to verify thermostat and system performance.
Symptom: HI is shown in the thermostat display.
Potential Solution: The temperature sensed by the thermostat
is higher than the 99˚ F (37˚ C) upper limit of the thermostat's
display range. The display will return to normal after the sensed
temperature lowers within the 40˚ to 99˚ F (4˚ to 37˚ C) display
range. Turn on the cooling system or use other methods to lower
the temperature accordingly.
This condition could occur from the system being turned off during an exceptionally
warm period or upon installation when the thermostat has been stored for a long
period of time in a warm vehicle or location prior to being installed.
Symptom: NO AUX SET is shown in the thermostat display.
(model 1200 and 1200NC only)
Potential Solution: The thermostat (model 1200 and 1200NC
only) is configured for a conventional system, and the system
switch is in the EM HEAT position. The unit will still function in
a conventional 2 stage HEAT mode, but the display will flash
NO AUX SET. Move the system switch to the HEAT position.
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