CSA 96MDT SERIES, Installation Instructions Manual

Page: 89 / 100

89
FAULT CODES & LOCKOUT
All lockout conditions can be cleared immediately provided
that the original fault causing the lockout is cleared and
power to the unit is cycled off and then back on again or
(soft lockout only) if a heat call is cycled off for greater than
2 seconds but less than 20 seconds.
The furnace control will not initiate a heat cycle during any
lockout condition. A call for compressor or continuous fan
will generally be responded to but control will display the
lockout error fault code instead of the “C” (for compressor)
or “F” (for Continuous fan).
FIVE-MINUTE LOCKOUT
A five minute “soft” lockout will be initiated if the low pres-
sure switch fails to close after 60 seconds of continuous in-
ducer operation at the beginning of a normal heat cycle
(pressure switch proving period). The seven-segment dis-
play will display the appropriate fault. Lockout will automat-
ically be reset after five minutes.
ONE-HOUR LOCKOUT
A one hour “soft” lock out will be initiated when:
Flame has not been detected after four ignition trials. -
Flame has been lost for five times in one heat call. -
Undesired flame has been detected. The one-hour -
period will commence after flame is no longer de-
tected.
Dead Blower has been detected (main limit circuit
-
open for more than 150 seconds)
When voltage has unexpectedly been detected on the
-
gas valve circuit and voltage goes away when inducer
is shut off.
If a
Water Sensed
condition is detected once during -
heat call (heat cycle terminated in response to fault)
and then clears and then is detected again within 5
minutes of the next heat attempt (same heat call).
The seven-segment display will alternately display “ 10
” and
the code number for the fault causing the lockout. Lockout
will automatically be reset after one hour.
HARD LOCKOUT
Three conditions shall cause a hard lockout:
1. The control senses an unspecified internal fault. Fault
code “
93
” is set and displayed. This lockout condition
cannot be reset by cycling the heat call.
2. Voltage is detected unexpectedly on the gas valve
contacts (welded relay) and will not clear by cycling
the inducer . Fault code “
93 ” is set and displayed.
This lockout condition cannot be reset by cycling the
heat call.
3. The furnace control will declare that the blower motor
is inoperable (dead) if the main limit control has been
open for more than 150 seconds. Gas heating is ter-
minated. However, the control continues to try to op-
erate heating for up to four attempts in case the blower
motor starts working again. If a dead blower has been
declared four times in one heat call, the furnace con-
trol enters a hard-lockout. Fault code “
61 ” is set and
displayed. This lockout condition CAN be reset by cy-
cling the heat call.
Fault Codes
fault code “ 57 ” (open high pressure switch) will be dis-
played alternately.
6. While the control is in one-hour lockout due to an un-
expected flame, the fault codes “ 14 ” (unexpected
flame) and “ 10 ” (soft lockout) will be displayed alter-
nately at the seven-segment display as described
above (A-D).
7. While the control has entered a one-hour lockout after
declaring 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.
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.
8. 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.
9. When the water level sensor has declared a 1-hr lock-
out after declaring a Water Sensed condition (heating
operation is shut down due to this fault) several times
consecutively. When the control enters lockout the
fault codes “
59 ” ( Water Sensed ) and “ 10 ” (soft lock-
out) will be displayed alternately as described above
(A-D).
LOCKOUT