Diagnostics And Fault Codes - Rheem 801T Series Installation Instructions Manual

FAULT CODES

DIAGNOSTICS AND FAULT CODES

All furnace controls come standard with a 7-segment diagnostic
display . During standby mode with no fault codes present, the
display will read "0" (zero) . During normal thermostat heating,
cooling or continuous fan operation, a letter will be displayed to
describe the mode of operation as follows:
C = Cooling or Heat-Pump Heat Operation
F = Continuous Fan Operation
H = Gas Heating Operation
When the control senses a fault present, it will display a code to
help in diagnoses . A list of normal operating codes and potential
fault codes follows:
CODE Description
0 STANDBY
C COMPRESSOR ON
(COOLING OR HEAT-PUMP HEAT)
H GAS HEAT ON
F CONTINUOS FAN ON
10 1 HOUR LOCKOUT
11 FAILED IGNITION
12 LOW FLAME SENSE
13 FLAME LOST
14 UNEXPECTED FLAME
20 TWINNING FAULT
22 MAIN LIMIT OR HALC OPEN
26 LINE AND NEUTRAL REVERSED
33 MRLC (MANUAL RESET LIMIT
CONTROL) (AKA ROLL-OUT) OPEN
55 PRESSURE SWITCH STUCK
CLOSED WHEN SHOULD BE OPEN
57 PRESS SWITCH STUCK OPEN
WHEN SHOULD BE CLOSED
61 BLOWER FAULT – BLOWER
UNABLE TO RUN
93 INTERNAL CONTROL FAULT
The method for displaying a two-digit fault is to display the first
(most significant) digit for one second immediately followed by
the second digit – which is also displayed for a duration of one
second . A ½ second pause is then displayed . Cycle repeats
until the fault is cleared . Each fault is flashed (displayed) a min-
imum of two times even if the fault condition has cleared before
the fault can be displayed twice .
DUAL FAULTS DISPLAYED
In some cases when two faults are present simultaneously, both
faults are displayed . These exceptions for dual faults are noted
below .
FAULT CODES
Sequence of display:
A . The first two-digit fault will be displayed once as described
above .
B . The upper-most horizontal segment of the seven-segment
display is energized for ½ second .
C . The second two-digit fault is displayed once as described
above .
D . The upper-most horizontal segment of the seven-segment
display is energized for ½ again .
This cycle repeats until one fault is gone (in which case the
remaining fault will be displayed as described above) or both
faults are gone or otherwise as noted below:
1 . When a failed ignition has occurred four times in a row, the
control enters one-hour lockout and fault codes "10" and
"11" will be displayed alternately as described above .
2 . When flame is lost five times in a row, the control enters
one-hour lockout and fault codes "10" and "13" will be dis-
played alternately as described above (A-D) .
3 . While the control is in one-hour lockout due to an unex-
pected flame, the fault codes "14" (unexpected flame) and
"10" (soft lockout) will be displayed alternately at the sev-
en-segment display as described above (A-D) .
4 . While the control has entered a one-hour lockout after de-
claring a dead blower after the main limit control has been
open for more than 150 seconds, the fault codes "61"
(Non-operational blower) and "10" (soft lockout) will be
displayed alternately as described above (A-D) . Note: the
dead blower fault and associated one-hour lockout will occur
up to four times in one heat call . Upon declaring this fault
for the fourth time in one heat call, the control will enter hard
lockout .
5 . When the main limit has been open during a gas heat call
for more than 150 seconds and has not yet re-closed, the
fault codes "61" (Non-operational blower) and "22" (open
limit) will be displayed alternately as described above (A-D)
until the limit re-closes .
The higher priority fault code will be displayed until the condition
is corrected then the lower priority fault code will display (pro-
vided the fault condition is still present) .
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