Troubleshooting; Fault Recall - White Rodgers 21V51D-751 Installation Instructions Manual

TROUBLESHOOTING

FAULT AND STATUS CODES
The LED will indicate fault or status codes as shown in the table below:
Green Amber
LED Flash LED Flash
OFF OFF
Alternate Alternate
Solid ON
Rapid Flash
1
2
3
Rapid flash
1
2
3
NOTE: Rapid Flash LED flash code uses 250ms ON time and 250ms OFF time.
Two-digit Red LED flash codes use 1s ON time, 250ms OFF time. There is a 1s OFF time between 1
error code. There is a 2s OFF time between each error code.

FAULT RECALL

When the control is in standby mode (no call for heat or cool),
press the "SELECT" button for approximately 2 to 5 seconds or
until the diagnostic LED turns off. Up to 5 fault codes are stored.
NOTE: While displaying the stored fault codes, the control will
ignore any new call for heat, cool or fan.
Emerson and White-Rodgers are
trademarks of Emerson Electric Co.
©2017 Emerson Electric Co. All
rights reserved.
TROUBLESHOOTING
Red
LED Flash
Up to 5 Flash Codes Stored in Memory (Auto-Erased After 14 Days)
11 No Stored Codes
12 Reversed 120 VAC Polarity / Grounding
14 Ignition Lockout (Due to Excessive Retries)
15 Ignitor Failure
16 Gas Valve De-Energized When It Should Be Energized
21 Gas Heating Lockout (Gas Valve Energized When It Should Be De-Energized)
Abnormal Flame Proving Signal
22
(Flame Sensed When Flame Should Not Be Present)
Low Heat Pressure Switch Did Not Open
23
(Shorted Pressure Switch, 1st stage)
24 Fuse is Open
25 High Heat Pressure Switch Did Not Open (Shorted Pressure Switch, 2nd stage)
High-Heat Pressure Switch or Inducer Relay Did Not Close or Re-opened
31
(Open Pressure Switch, 2nd stage)
Low-Heat Pressure Switch or Inducer Relay Did Not Close or Re-opened (Open
32
Pressure Switch, 1st stage)
33 Limit Circuit Fault (Open Limit or Roll Out)
34 Ignition Proving Failure (Due to Ignition Recycles)
Flash codes NOT stored in memory
No 120 VAC and 24 VAC Power
OFF
Control Circuitry Lockout
Alternate Self-Test Mode Active
Standby
Fan Only Call
Call For Low Cool
Call For High Cool
Blower On After Power Up
Weak Flame Error
Call For Low Heat
Call For High Heat
Defrost Mode
Rapid flash Twinning Error
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Error / Condition
FAULT CODE RESET
When the control is in standby mode (no call for heat or cool),
press the "SELECT" button for 5 to 10 seconds or until the
diagnostic LED begins to rapid flash.
NOTE: If the switch is held pressed for over 10 seconds the
rapid flash will stop and the LED will be on to indicate
return to normal status.
and 2 digit of the
st nd