Red LED off No power to control or board fault

What the control is telling you

Red LED is dark: the control has no power or has detected a board fault.

Applies to: EL195UHNE furnaces with ignition control 103217-03 or 107163-01 (red LED)

Likely causes

• No 120 V supply (breaker, switch, door interlock open)
• Tripped 3 A 24 V circuit breaker CB8
• Failed transformer T1
• Failed integrated control

Test and repair steps

1. Check the blower door is on (door interlock S51 is in series with line voltage).
2. Check breaker/disconnect and 120 VAC at the control LINE and NEUTRAL terminals.
3. Check and reset circuit breaker CB8 (3 A at 32 V) in the control box; if it trips again look for a 24 V short.
4. Check 24 VAC output of the 40 VA transformer.
5. If power is present and the LED stays off, replace the control.

Settings for these units

Filter sizes (filter rack kits) · Lennox EL195UHNE

Filters are field supplied; check monthly.

100NE60C over 1800 cfm with single side return needs a 20 x 25 x 1 filter via return air base and transition.

Models that show this code

4 models in Lennox EL195UHNE

Other codes on the same units

• 7 flashes Primary or secondary limit open
• 8 flashes Rollout switch open
• 9 flashes Pressure switch stays open or drops out on a heat call
• 10 flashes Watchguard - pressure switch opened 5 times in one heat demand
• 11 flashes Pressure switch stuck closed before inducer starts
• 12 flashes Flame sensed with gas valve off
• 13 flashes Low line voltage
• Red LED on steady Board fault detected (107163-01)