Dettson C105-2-V, Installation Instructions And Homeowner'S Manual

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Table 25 – Error Codes
Green
LED
FLash Amber
LED
Flash Red
LED
Flash Erreur/Conditions Comments/Troubleshooting
Furnace doesn’t operate. Control
board LED’s are off.
Door switch is defective or open. There is no
120V to the board.
1 Flame sense when no flame should
be present. Verify the gas valve is operating and shutting
down properly. Flame in the burner assembly
should extinguish promptly at the end of the
cycle.
2 Pressure switch stuck closed Faulty pressure switch, pressure switches
wires shorted, control board inducer relay
stuck closed
3 First stage pressure switch stuck
open Faulty pressure switch or tubing or wiring,
control board inducer relay failed, restriction
at the vent, blocked vent
4 High limit and/or rollout switch open Verify temperature rise and airflow, duct static
pressure, burners alignment, wiring to both
switch (high limit and rollout).
5 Open fuse Check fuse and replace.
6 Pressure switch lockout, pressure
switch has opened 5 times in a
heating cycle. Check for venting restriction, verify pressure
switch tubing for leaks.
7 Lockout after multiple failed ignition. Check gas pressure and gas valve. Make
sure flame rod is clean and properly wired.
Check ignitor and its connection.
8 Lockout after multiple flame lost. Check gas pressure and gas valve. Make
sure flame rod is clean and properly wired.
9 Improper grounding or polarity 120V hot and neutral reversed. 120V should
be read between Hot and ground. 0V should
be read between Neutral and ground.
10 Gas valve current detected with no
call for heat. Verify if any electrical short could send
voltage/current to the gas valve.
If not,
replace control board.
11 Open limit switch for more than 5
minutes. Reset the unit and verify blower is
functionning at proper speed. Verify
temperature rise and airflow, duct static
pressure, burners alignment, wiring to both
switch (high limit and rollout).
12 Ignitor relay on control board is not
functionning. Replace control board.
Solid
ON Internal control board error Reset control. Replace control board if error
code is still present.
3
double Second stage pressure switch stuck
open. Check for faulty pressure switch, tubing or
wiring. Check for restriction at the vent. Make
sure inducer blower is functionning properly.
1 Normal operation with call for first stage
heating.
2 Normal operation with call for second stage
heating.
3 Call on W2 without call on W1 Verify thermostat and wiring.
4 Call on Y or Ylo without call on G Verify thermostat and wiring.
Rapide Low flame sense Clean flame rod with steel wool. Check gas
outlet pressure.
1 Normal operation with call for 1st stage
cooling.
2 Normal operation with call for 2nd cooling or
Single stage cooling.
Rapid Normal operation with call for fan on.
Solid
On Normal operation, standby mode
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