TFTN 085-199 Installation and Operation Manual
Improper combustion settings – test combustion at Max
and Min Power as per section 9.0 – Gas Valve and Burner
Setup
Restricted air-intake or exhaust – check for restrictions
Dirty combustion chamber or burner – clean the
combustion chamber and burner
Dirty or fault flame sensor – clean the flame sensor with a
mild abrasive or replace the flame sensor.
Blocked condensate drain – ensure the condensate drain
is clear and drains freely
Damaged flame sensor cable – inspect flame sensor wire
for loose connections, shorts to ground or damage.
5P1 – 1st Ignition Failed
Flame signal did not
meet the minimum
threshold on the 1
st
ignition attempt
Normal operation – 5P1 may be displayed momentarily if
there is a problem the boiler will lock out. Follow the
directions for the lockout
5P2 – 2nd ignition
attempt failed
Flame signal did not
meet the minimum
threshold on the 2
nd
ignition attempt
5P6 – 3rd ignition
attempt failed
Flame signal did not
meet the minimum
threshold on the 3
rd
ignition attempt
5P3 – Detection of Flame
loss during
run
Flame signal was lost
during run
Wind – in some applications the flame will occasionally lift
during run due to excessive wind
Blocked venting – ensure nothing is obstructing the
venting
Combustion settings or Gas pressure – if the problem is
persistent a lockout will result, follow the trouble
shooting for the lockout. If the flame loss is bothersome
and does not result in a lockout, see error 504.
602 – Flue sensor or flue
too hot
Exhaust temperature
exceeded 200°F (the
error can only be
cleared when the flue
temperature drops
below 190°F for 1
minute)
Inadequate water flow – ensure the boiler water is free of
air and pressurized to a minimum of 12 psi
Dirty Combustion chamber – ensure the combustion
chamber is cleaned regularly
Water scaling – if the error is accompanied by popping or
hissing, the boiler may have scale build-up preventing
proper heat transfer. Descale the heat exchanger if
needed.
Faulty wiring – check the wiring to the Flue sensor for
water or corrosion
Faulty sensor – check for proper readings from the Flue
sensor (see Table 18-2).
Blocked condensate
switch openned
Blocked Condensate – ensure the condensate is draining
freely and the tubing to the switch is clear
Blocked vent – check the exhaust and air-intake venting
for blockages.
Wiring problem – inspect the wires from the air switch to
the boiler control. Disconnect and reconnect each
connection
Air switch failure – replace the air switch
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