CODE
DESCRIPTION
0
Stand-by
Gas Heating mode.The furnace is in heating mode.
The digit displayed after in the input of the furnace.
H"0"
For example, H0 means the furnace is heating
at 100%.
approximately 50%.
Indicates the furnace is in cooling mode (any stage)
C
for communicating system and high stage for legacy
system
This code indicates the furnace is in heat pump
HP
heating mode (any stage)
F
Fan Mode : The furnace is in continuous fan mode
Defrost mode : Indicate the heat pump is in defrost
dF
mode and gives supplemental heat
The memory card is corrupt, invalid or there is no
memory card installed. This is a none critical fault
d4
and the furnace may operate if it finds shared data on
the network (t-stat and control). d4 will only be display
when furnace is in standy mode
No shared data : displayed when no shared data is
d1
available. The furnace cannot function.
Displayed after four failed ignition attempts.
10
furnace will goes inot a lockout mode and will not
attempt to ignite again for 1 hour.
11
Failed ignition.
12
The flame sense current is weak or weird
13
Flame lost
This fault indicate flame is present when it should not
14
be
Igniter fail : could be the ignitor itself or the control
16
relay.
The main limit has opened or sensed opened.
22
Temperature in the heat exchanger has gone above
prescribe temperatures
Indicates that line voltage and neutral are reversed to
26
the furnace control.
30
3 amps fuse open
33
The rollout limit switch on the burner box is open
The low pressure switch is close when it should not
44
be
Indicates the low pressure switch is open when the
45
inducer is energized at high speed
Indicates the low pressure switch is open when the
46
inducer is energized at low speed
Table 20 – Fault Code
H5 means the furnace is heating at
SOLUTION
No fault
Replace the memory card
Replace the memory card
It all depends on what caused the 4 failed ignition.
The error codes prior to 10 shall be retreive on the
The
communicating thermostat or by pushing the fault
recall button for 3 sec.
sensor, check your gas pressure, check the ignitor.
If some burners seems to have difficulties to stay on,
replace the burner box.
(1) Make sure the gas valve is on (2)Clean or
replace de flame sensor (3) Make sure the furnace
is grounded (4) Make sure gas outlet pressure is fine
(5) Replace gas valve if it is not functionning
(1) Clean or replace de flame sensor (2) Check gas
outlet pressure (3) Take a combustion analysis. A
dirty flamme sensor needs to be investigate.
(1) Clean or replace de flame sensor (2) Check gas
outlet pressure (3) Check the burner box assembly
(1) Wire properly (2) Check gas valve (3) Check
furnace control
(1) Change ignitor (2) Change control
(1) Check for blower operation.
needed (2) Check ductwork an filters (3) Check for
temperature rise and furnace gas valve pressure
Check voltage with meter and reverse if necessary
Replace the 3 amp fuse on the furnace control
(1) Check gas pressure (2) Check for proper
venting and venting length (3) Check pressure switch
operation and connection (4) Check for proper ID
blower operation
(1) Check for venting length, less than 5ft is not
enough, adding 90° elbow could be a solution (2)
Check for wind draft at the venting termination, if
necessary, relocate termination (3) Check pressure
switch et replace if necessary (4) Check for ID blower
function
Check pressure switch and its wiring
(1) Check the vent system for blockage (2) Check
the vent length , remove excessive vent (3) Faulty or
disconnected ID blower (4) Faulty control board (5)
Wind gust (6) Faulty pressure switch
36
Usually, clean the flame
Change motor if