Carrier WeatherMaster Puron 48HC D17 Service And Maintenance Instructions page 44

LED
FLASH DESCRIPTION
CODE
On Normal Operation
Off Hardware Failure
2 Flashes Limit Switch Fault
3 Flashes Flame Sense Fault
Four Consecutive Limit
4 Flashes
Switch Fault
5 Flashes Ignition Fault
Induced Draft Motor
6 Flashes
Fault
7 Flashes Rollout Switch Lockout
8 Flashes Internal Control Lockout No gas heating.
Temporary Software
9 Flashes
Lockout
LEGEND
IGC — Integrated Gas Unit Control
LED — Light-Emitting Diode
Table 19 — IGC Board LED Alarm Codes
ACTION TAKEN
RESET METHOD
BY CONTROL
—
No gas heating.
Gas valve and igniter
Off. Limit switch closed, or
Indoor fan and heat call (W) Off.
inducer On.
Flame sense normal.
Indoor fan and
Power reset for LED
inducer On.
reset.
Heat call (W) Off. Power
No gas heating.
reset for LED reset.
Heat call (W) Off. Power
No gas heating.
reset for LED reset.
If heat off: no gas
heating. Inducer sense normal, or
If heat on: gas valve heat call (W) Off.
Off and inducer On.
Gas valve and igniter
Off.
Power reset.
Indoor fan and
inducer On.
Power reset.
1 hour auto reset, or
No gas heating.
power reset.
—
Loss of power to the IGC. Check 5 amp fuse on IGC,
— power to unit, 24V circuit breaker, transformer, and
wiring to the IGC.
High temperature limit switch is open. Check the
operation of the indoor (evaporator) fan motor. Ensure
that the supply-air temperature rise is within the range
on the unit nameplate. Check wiring and limit switch
operation. Check/clean return air filters. Check burner
assembly manifold pressure to ensure proper firing rate.
The IGC sensed a flame when the gas valve should be
closed. The minimum flame sensing microamps is
0.5 ma. Check wiring, flame sensor, and gas valve
operation.
4 consecutive limit switch faults within a single call for
heat. See Limit Switch Fault.
Unit unsuccessfully attempted ignition for 15 minutes.
Check igniter and flame sensor electrode spacing, gaps,
etc. Check flame sense and igniter wiring. Check gas
valve operation and gas supply.
Inducer sense On when heat call Off, or inducer sense
Off when heat call On. Check wiring, voltage, and
operation of IGC motor. Check speed sensor wiring to
IGC. Check to ensure Hall Effect wires are not rubbing
against cabinet sheet metal.
Rollout switch has opened. Check gas valve operation.
Check induced-draft blower wheel is properly secured to
motor shaft.
IGC has sensed internal hardware or software error. If
fault is not cleared by resetting 24 v power, replace the
IGC. Check gas valve connections to IGC terminals.
BRN lead must be on Pin 11. Check that W1, W2 and
Com are correctly connected to the gas valve terminals.
Electrical interference is disrupting the IGC software.
NOTES:
1. There is a 3-second pause between alarm code displays.
2. If more than one alarm code exists, all applicable alarm codes will
be displayed in numerical sequence.
3. Alarm codes on the IGC will be lost if power to the unit is interrupted.
44
PROBABLE CAUSE
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