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440 01 2021 01
Heating Request with Gas Shut Off:
24 VAC signals applied to W1 terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call
remains. Power reset will clear lockout.
· Inducer motor turns on at high speed.
· Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins warm up.
· The ignitor glows red--hot for 22 seconds, then turns off. The FCB flashes error code 6.
· The ignitor stays off for 17 seconds, then begins to warm up again.
· The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
· The ignitor stays off for 17 seconds, then begins to warm up again.
· The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
· The ignitor stays off for 17 seconds, then begins to warm up again.
· The ignitor glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout. Stops flashing
error code 6, and begins flashing error code 6 + 1.
· The inducer motor de--energizes 15 seconds after error code 6 + 1 starts flashing.
Furnace Control Board Diagnostic Codes (See Figure 53)
OFF = 24VAC or 115VAC is off, fuse is open
Heartbeat = Normal operation or no previous Diagnostic Code
ON SOLID = Soft Lockout -- Furnace Control Error (1 hr delay)
If code repeats immediately following power reset then replace control
1 Flash = Not used
2 Flashes = Pressure switch(es) closed when should be open
3 Flashes = Low pressure switch open when should be c losed
4 Flashes = Limit or flame roll--out switch open (less than 2 minutes)
5 Flashes = Flame sensed out of sequence
6 Flashes = Failure to ignite or flame sense lost while running
6 + 1 Flashes = Soft Lockout -- Max of four trials for ignition reached (3hr delay)
7 Flashes = Soft Lockout -- Limit or flame roll--out switch open longer than 2 minutes (1 hr delay)
(roll--out switch requires manual reset)
8 Flashes = Permanent Lockout -- Gas valve relay contact stuck closed or miswired gas valve (power reset only)
9 Flashes = High pressure switch open when should be closed
10 Flashes = Improper transformer phasing on twinned applications or improper line v oltage polarity.
* If status code recall is needed, briefly (2--3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored
status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared
after 72 hours or upon power reset.
* Proper flame sense microamps: 0.7 microamps D.C. minimum, 2.0 -- 4.0 microamps nominal
Figure 53
Control Board
25--24--74
Diagnostic Light
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