S2200D Operation and Service Manual
P/N 974-9246 Rev 5.00 Jan 18,2022
17
B-Fan starts. Flame does not start
Green
Light
Red
Light
Error
Code
Symptoms
Possible Problem
OFF
ON
126
Siemens displays “P20-
P21-P22-LOC20” in se-
quence.
Signal to X5-01-2 disconnected
Gas inlet pressure switch fail-
ure (when installed)
OFF
ON
126
Siemens displays “P21-
P22-LOC3” in sequence
No air pressure indication
Air tube leaking or disconnected
Air switch adjusted too high
Air tubes plugged in wrong posi-
tion (“-“ instead of “+”)
Air switch defective (NO contacts
stay open when fan is working)
OFF
ON
126
Siemens displays “P21-
P22-LOC3” in sequence.
PCB Failure
Remote air switch harness
defective or disconnected
OFF
ON
126
Siemens displays” P21-
P22-P30-P40-P42-LOC2”
Inlet pressure too high (over 5 psi)
regulator damaged
Solenoid valve damaged or valve
electric circuit defective
Gas pressure too low
Manual cut off valve closed
Interruption in flame continuity
Strainer plugged or dirty
OFF
ON
127
Siemens displays “P21-
P22-P30-P10-OFF” in
sequence.
fan motor/overload defective
OFF
ON
126
155
Siemens displays “P21-
P22-P30-P40-P42-LOC 2“
High limit switch failure