S2200D Operation and Service Manual
P/N 974-9246 Rev 5.00 Jan 18,2022
19
Green
Light
Red
Light
Error
Code
Symptoms
Possible Problem
OFF
ON
126
Siemens displays “LOC7”.
Combustion unstable, burner
fails to stay lit, and low outlet
air temperature
Changeover valve set to propane
when connected to natural gas
OFF
ON
126
Siemens displays “LOC7”.
Combustion unstable burn-
er fails to stay lit, and high
outlet temperature
Changeover valve set to natural
gas when connected to propane.
OFF
ON
126
156
Siemens displays “LOC 7”
Burner doesn’t cycle.
Heater runs through one
cycle and then turns off.
Heater High limit switch opens
Heater Hi limit switch failure – too
sensitive
OFF
ON
126
Siemens displays “LOC 7”
Interruption in gas delivery
Clogged filter or strainer
Defective safety solenoid valves
Gas regulator vent is plugged
UV sensor failure
OFF
ON
147
Siemens displays “P74-
P10-OFF”. Fan undergoes
a short post purge then
stops.
Heater is tilted too much/unstable
Heater flat on its side
PCB failure