E2 Low-stage pressure switch will not close

What the control is telling you

The inducer runs but the low-stage pressure switch never closes, so there is no ignition. The inducer may keep running. ComfortNet thermostat shows PS1 OPEN E2.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

• Pressure switch hose blocked, pinched or on the wrong port
• Blocked vent or intake pipe
• Blocked condensate drain
• Weak inducer
• Wrong switch set point or bad switch
• Loose or wrong wiring

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Check the switch hose for water, kinks and cracks and that it is on the right tap.
3. Check the vent and intake pipes for blockage, length, elbows and termination.
4. Check the drain trap and drain lines. A plugged drain will hold the switch open.
5. Check the inducer runs at full speed with no noise or wobble.
6. Check the wiring at the switch. Replace the switch or inducer only with the correct parts.

Settings for these units

• Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
• Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
• Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
• Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

Other codes on the same units

• d0 No shared data on the control
• d4 Memory card data rejected
• E0 Lockout - ignition failed 3 times
• E1 Low-stage pressure switch closed at start of heat
• E3 High limit or rollout limit open
• E4 Flame sensed with no call for heat
• E5 Control fuse open
• E6 Low flame signal