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19 68-0076—1
System Press Look For This Response
Switch This Key
Position Key Down Key Released
OFF 03 Blank
07 Blank
15 Blank
COOL or 15 1st stage cooling, fan and
AUTO SYSTEM LED on.
(with fan 15 2nd stage cooling also on.
in AUTO)
15 2nd stage cooling off.
15 1st stage cooling, fan and
SYSTEM LED on.
OFF 06 Blank
02 Blank
05 Blank
04 Blank
01 Control microprocessor
mask no. and revision no.
00 Blank
(CHECK 12 See note A .
EACH )
POSITION)
OFF 08 Blank
13 Interface microprocessor
mask no. and revision
no.
09 Blank
14 Blank
HEAT or 14 1st stage heating, fan
AUTO and SYSTEM LED on.
(with fan 14 2nd stage heating also on.
in auto)
14 3rd stage heating and AUX.
HT. LED also on.
14 3rd stage heating and AUX.
HT. LED off.
14 2nd stage heating also off.
14 1st stage heating, fan and
SYSTEM LED also off.
OFF 10 Blank
11 Normal operating display
A HEAT displayed when system switch is in HEAT, COOL
when in COOL, HEAT and COOL when in AUTO, neither
when in OFF. Also, a four-digit code is displayed. Expla-
nation for each digit is following.
Fig. 14—All segments on display.
2. Set system switch to OFF. Press and release AHEAD,
BACK, and PRESENT SETTING keys at the same time to
enter self-test.
3. Press each key as listed below, and look for re-
sponses listed as key is held down and released. Keys may
be pressed in any order except RUN PROGRAM should
be pressed last because it ends self-test.
M 525A
AM
SUN
MORNING
REPL
BAT
SET
PT
ROOM
PM
OUTDOOR
TUE WED THU FRI SAT TEMPORARY
MON
MIDDAY EVENING NIGHT COOL ON HEAT ON
CHANGE
TO LAST
PERIOD
SKIP
NEXT
PERIOD
PRESENT
SETTING
PRESENT
SETTING
PRESENT
SETTING
PRESENT
SETTING
PRESENT
SETTING
WARMER
COOLER
AHEAD
BACK
COPY
FROM
COPY
TO
PERIOD
CANCEL
PERIOD
DAY
SET
HEAT/COOL
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
HOLD
TEMP
RUN
PROGRAM
T8611M
CHECKOUT
FAN
Move the system switch to OFF, and the fan switch to
ON. The fan should run continuously. When the fan switch
is in the AUTO position, fan cycles with the heating or
cooling system.
INSTALLER SELF-TEST (OPTIONAL)
IMPORTANT:
• Thermostat must have ac power to perform self-test.
• Five-minute time delay on compressor does not
function during self-test.
Perform the following test as a check of all thermostat
functions. If thermostat does not respond as indicated,
thermostat and subbase must be replaced.
1. Press AHEAD and BACK keys at the same time.
While holding keys down, all segments of the display
should be on (see Fig. 14).