Goodman furnace P2: High stage compressor, heating mode

P2 means the heat pump is heating on its high stage. It is the heat pump working harder before the system hands over to the furnace.

Applies to: Goodman GMVC96, GMVM97, GCVC96, GCVM97 and Amana AMVC96, AMVM97 series gas furnaces with a two-character alphanumeric display, installed as part of a dual fuel system with a two-stage heat pump.

What it means

A two-stage heat pump has a low and a high output, and P2 means it is running on high. On a dual fuel system this typically happens as conditions get colder, before the switchover point where the gas furnace takes over. Seeing P2 for long periods suggests the system is near that boundary. It is normal operation, and its diagnostic value is contextual: a heat pump sitting at high stage while the house fails to keep up means the switchover point may be set too low, leaving the heat pump doing work the furnace should have taken.

Most common causes

The heat pump running at full output as conditions get colder. This is normal.
A recovery period after a thermostat setback.
Outdoor conditions approaching the dual fuel switchover point.
A switchover point set lower than is efficient for the property.

How to diagnose it

Confirm the system is dual fuel with a two-stage heat pump.
Note the outdoor temperature and whether the house is keeping up.
Note whether the system eventually switches to the furnace as it gets colder.
If the heat pump sits at high stage for long periods without maintaining temperature, the switchover point is worth reviewing.

How to fix it

Nothing to fix if the house is comfortable and the system switches over as it gets colder.
If the heat pump runs flat out without keeping up, have the switchover configuration reviewed.
Check the air filter and registers if the house is not reaching temperature.
Have the heat pump's refrigerant charge checked if performance has degraded over time, since that reduces capacity.

Notes

Dual fuel switchover is a comfort and cost trade-off rather than a fixed correct answer. Where it should sit depends on local energy prices and the property, which is why it is worth a conversation rather than a default.

All codes for this manufacturer

Goodman and Amana furnace fault codes — every code, with what differs between models.

Sources

Goodman Manufacturing — Diagnostic Code Identification System (model-specific fault code lookup)

This site is a reference, not a substitute for a licensed HVAC technician. Gas appliances can leak carbon monoxide and cause fire. Anything involving gas lines, the heat exchanger, or the flame sensing circuit should be handled by a licensed professional. Pages are written with AI assistance from the sources listed on each page and checked against them before publishing.