40
Lockout
1-STAGE LOCKOUT
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 pressure
switch fails to close after 60 seconds of continuous inducer op-
eration at the beginning of a normal heat cycle (pressure switch
proving period) . The seven-segment display will display the
appropriate fault . Lockout will automatically 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 detected.
- 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 .
The seven-segment display will alternately display “
10
” and the
code number for the fault causing the lockout . Lockout will auto-
matically 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 can-
not be reset by cycling the heat call .
3 . The furnace control will declare that the blower motor is in-
operable (dead) if the main limit control has been open for
more than 150 seconds . Gas heating is terminated . How-
ever, the control continues to try to operate 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 control enters a hard-lockout . Fault code
“61”
is set and displayed . This lockout condition CAN be
reset by cycling the heat call .
Summary of Contents for 801C Series
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