Installation and Operation Manual TFTN 085-199
412 – Room sensor
circuit open or short
circuit Zone 3
Room sensor circuit
open or short circuit
Zone 3
BUS wiring damaged – Inspect BUS wiring for bad
connections
Damaged PCB – If nothing is wired to the BUS
connections, replace the PCB.
441 – Follower Boiler
Missing from BUS
Follower Boiler Missing
from BUS
Single boiler configured as a Manager boiler – if this is a
stand-alone boiler, set Boiler Address = Single Boiler, see
Cascade Setup section
Follower BUS wires disconnected – Inspect BUS wiring for
damage or shorts, BUS wiring is polarity sensitive.
Follower boiler turned off – ensure power is on for all
boilers in cascade
460 – External safety
lock
Open circuit at AUX
LIMIT
External limit switch wired to AUX LIMIT input is open –
check device. If an external limit switch is not being used,
place a jumper across AUX LIMIT.
NOTE: error type is Manual Reset if parameter 24.6.5 is
set to “Safety lock not volatile”
501 1 – Ignition failed
(x3)
Boiler failed to sense
flame signal during
ignition (3x in a row)
Improper Gas pressure – verify that the gas pressure
during an ignition attempt is within the range specified in
section 9.0 – Gas Valve and Burner Setup.
Blocked air-intake – remove front cover and inspect the
venturi and boiler air inlet silencer for debris.
Blocked exhaust – inspect exhaust for proper slope to
boiler and possible restrictions or blockages
Blocked condensate drain – inspect condensate drain, if
the drain was clogged water may have entered the gas
valve. If the valve was wet, it must be replaced.
Improper LP conversion – check conversion instructions,
increase the gas flow by adjusting the input screw. **A
combustion test must be performed if the gas valve is
adjusted.
No spark – inspect the igniter for cracks or warping
(electrode gap should be 3/16"-1/4"). With the gas supply
valved off and the igniter removed, observe the spark
during the trial for ignition – it should spark for 3-5
seconds. If there is no spark check that the spark
transformer receives 120VAC during the ignition trial.
Improper combustion settings – adjust the gas valve
Throttle Screw to increase the gas flow. Once the boiler
remains lit set combustion. See section 9.0 – Gas Valve
and Burner Setup.
Warning: this process may only be performed by a
qualified technician with a combustion analyzer
Faulty flame sensor – if the boiler lights well and has a
strong flame, replace the flame sensor, and inspect the
flame sensor harness for shorts or damage.
502 – Flame detected
out of sequence
Flame detected before
the gas valve was
turned on
Faulty flame sensor – check the flame sensor and wiring
for damage, water or other possible shorts to ground
(replace flame sensor)
Faulty PCB – if problem persists, replace the PCB.
504 – Flame lost ten
times during run
Flame signal lost during
run (10x in a row)
Improper Gas pressure – verify that the gas pressure
during an ignition attempt is within the range specified in
section 9.0 – Gas Valve and Burner Setup.
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