E9 High-stage pressure switch will not close

What the control is telling you

On a call for high heat the high-stage pressure switch does not close. The furnace keeps running on low stage only.

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 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 and taps.
3. Check the vent and intake pipes for blockage, length, elbows and termination.
4. Check the drain trap and lines.
5. Check inducer performance.
6. Check the wiring, then replace the switch or inducer with the correct part if needed.

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

• E1 Low-stage pressure switch closed at start of heat
• E2 Low-stage pressure switch will not close
• E3 High limit or rollout limit open
• E4 Flame sensed with no call for heat
• E5 Control fuse open
• E6 Low flame signal
• E7 Igniter circuit fault
• E8 High-stage pressure switch closed at start of heat