55
®
F16
Gas pressure limit
The measured gas pressure is outside the operating limits (subset: valve
prove status), or the gas pressure sensor is not responding correctly
Subset: 10.
See option parameter 2.0 for details on changing the operating limits.
F17
Forced lockout
A high level on an auxiliary input has forced a lockout.
F18
Not enough setpoints
entered
A fuel/air ratio profile has been selected which does not have at least four set-
points commissioned. Use commission ratio mode to enter more setpoints.
Subset: fuel code
F19
CPU board voltage
reference
The CPU board has an incorrect on-board reference level.
Subset: measured reference, where 512 = 2.5V
F20
Potentiometer supply
incorrect
The unit has detected that the supply voltage to the potentiometers is too high
or too low.
Is the potentiometer supply voltage selection link installed?
Are the potentiometers wired correctly?
Subset: expected potentiometer voltage (5/15)
F21
Burner input
The burner inputs (FUEL 1 SEL, FUEL 2 SEL, FAULT MUTE, AUX 1 to AUX 5,
FLOW or NO FLOW [for either airflow sensor]) are not responding correctly.
Subset: faulty input (1-512)
F22
Forced lockout
gas firing
A forced lockout has occurred due to the removal of the high level on auxiliary
input configured to provide this function, when the unit is firing on gas.
F23
Forced lockout
oil firing
A forced lockout has occurred due to the removal of the high level on auxiliary
input configured to provide this function, when the unit is firing on oil.
F24
Forced lockout gas
during modulation
A forced lockout has occurred due to the removal of the high level on auxiliary
input configured to provide this function, when the unit is modulating on gas.
F25
Shutdown relay
The safety shutdown relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F26
Gas valve 1 relay
The main gas valve 1 relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F27
Gas valve 2 relay
The main gas valve 2 relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F28
Pilot valve relay
The pilot valve relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F29
Vent valve relay
The vent valve relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F30
Ignition transformer
relay
The ignition transformer relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F31
Oil valve relay
The oil valve relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F32
Auxiliary relay
The auxiliary relay is not responding correctly.
Subset: required state (0 - off, 1 - on)
F33
Gas Proof of Closure
The gas (main 2) valve proof of closure signal is not responding correctly.
NO
LED
A B C D E F G
NAME
DESCRIPTION
= LED ON
= LED OFF
