Troubleshooting - White Rodgers 50M56U-751 Installation Instructions Manual

Green LED Flash Amber LED Flash
11
OFF
44
Rapid
Solid ON
Two Digit Flash Codes: The 1st digit is the number of short flashes, the 2nd digit is the number of long flashes
Example: Ignition failure would display on the Red LED as 3 short flashes followed by 4 long flashes
Fault Recall
When the control is in standby mode, press and
hold the "FAULT RECALL" button (approximately 3-5
seconds) until the solid green LED turns off, then
release the button.
NOTE: While displaying the stored fault codes, the
control will ignore any new call for heat, cool or fan.
Fault Code Reset
When the control is in standby mode, press and hold
the "FAULT RECALL" button until the diagnostic LED
begins to rapid flash (approximately 7-10 seconds)
then release the button. The LED will turn off for
2 seconds after fault codes are erased. Faults will
automatically be cleared from memory after 14 days.
Red LED Flash
Up to 5 Flash Codes Stored in Memory (Auto-Erased After 14 Days)
Flash Codes NOT Stored in Memory
Solid ON
11
OFF
41
42
43
Error / Condition
13 Limit / Roll-Out Lockout
14 Ignition Lockout - After 3 Retries
15 Ignition Lockout - After 10 Recycles
17 Ignitor Failure - Replace Ignitor
21 Gas Heating Lockout
22 Abnormal Flame Proving Signal
23 LPS - Pressure Switch Did Not Open
24 Secondary Voltage Fuse is Open
25 Reversed 120V Line Polarity
26 HPS - Pressure Switch Did Not Open
27 Bad Ground
31 LPS - Pressure Switch Did Not Close
33 Limit or Flame Rollout Switch Open
34 Ignition Failure
36 HPS - Pressure Switch Did Not Close
12 Blower on After Power Up
Rapid Twinning Error
Internal Fault - Replace Control
11 Component Self Test - Colors Alternate
OFF No Power - Check L1/L2 & SEC-1/SEC-2
Weak Flame Sensed
Normal Heat Mode (W)
Normal Cool Mode (Y)
Normal Fan Mode (G)
Control Power Up - Test Mode Entry
Standby Mode
NOTE: If the switch is held pressed for over
seconds, faults will not be cleared, rapid flash will stop,
and the LED will be solid green to indicate return to
standby.
Control Reset
Control reset is automatic after 1 hour in lockout.
Removing 24 VAC power to the control for greater than
10 seconds will manually reset the control.
Flame Current Test
Set multimeter to DC volts and place leads on the
flame current sense pins. Read the voltage directly as
microamps (1 VDC = 1μA) with the burners on.
Reading results: 0.5 – 1.0 = marginal, 1.0 – 5.0 =
good.

TROUBLESHOOTING

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