E3 High limit or rollout limit open

What the control is telling you

The primary limit, auxiliary limit or a rollout limit is open. The blower keeps running and the burners stay off. ComfortNet thermostat shows HIGH LIMIT OPEN E3.

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

Likely causes

• Low airflow over the heat exchanger: dirty filter, restricted ducts, wrong blower speed, failed blower motor
• Flame rollout from misaligned burners, a blocked vent or intake, or a failed inducer
• Loose or wrong wiring

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Check the filter and duct system first. Clean or replace the filter and open any closed registers.
3. Check the blower speed setting and motor. Temperature rise must be inside the rating plate range.
4. Rollout limits are manual reset. If one tripped, find out why before you reset it: check burner alignment, vent and intake pipes, and the inducer.
5. The auxiliary limits near the blower are also manual reset.
6. Tighten or fix any loose limit wiring.

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

• d4 Memory card data rejected
• E0 Lockout - ignition failed 3 times
• E1 Low-stage pressure switch closed at start of heat
• E2 Low-stage pressure switch will not close
• E4 Flame sensed with no call for heat
• E5 Control fuse open
• E6 Low flame signal
• E7 Igniter circuit fault