mypros+
Error code reference

Goodman Air Conditioner Error Code EH

Emergency Hydronic Engaged

Goodman codesGoodman air conditioner codes

Emergency Hydronic Engaged - the EHH switch is closed and compressor is switched off.

First step from the service manual

Open front emergency hydronic switch to allow occupant unit operation.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for EH.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What EH means on a Goodman air conditioner

The EH error code on a Goodman air conditioner stands for Emergency Hydronic Engaged. This condition is triggered when the Emergency Hydronic Heating (EHH) switch is detected in the closed position. When this switch closes, the unit's control board interprets it as a signal to disable the compressor entirely and hand off heating duties to a hydronic heating system, such as a hot water coil supplied by a boiler. This is an intentional operational state rather than a fault condition, meaning the system is functioning as designed when this code appears.

The EHH switch is a physical switch, typically located on or near the front of the unit, that allows a building operator or technician to manually engage emergency hydronic heat. In multi-zone or commercial hydronic systems, this switch is used when the primary refrigeration-based heating is unavailable or needs to be bypassed. When the switch is closed, the compressor lockout is enforced at the control board level to prevent simultaneous operation of the refrigerant circuit and the hydronic heating source.

Because the EH code reflects a deliberate switch state rather than a component failure, the diagnostic path is straightforward. The first step is to confirm whether emergency hydronic heat is actually needed. If not, opening the EHH switch restores normal compressor operation and clears the code. If the switch appears open but the code persists, the wiring circuit or the switch contacts themselves may need to be inspected for a short or a stuck-closed contact.

Source: manufacturer service documentation.

Common causes of EH

  1. 01

    EHH switch manually closed

    Wiring / connection

    The most common cause is that a technician or building operator intentionally closed the emergency hydronic switch, either for testing or during a heating emergency. Visually inspect the switch position at the front of the unit and open it to restore normal operation.

  2. 02

    Switch accidentally bumped or toggled

    Wiring / connection

    The EHH switch may have been inadvertently closed during routine maintenance or cleaning activity near the unit. Check the switch position and confirm it is fully in the open position.

  3. 03

    Stuck or shorted switch contacts

    Part replacement

    If the EHH switch appears to be in the open position but the EH code remains active, the internal contacts of the switch may be stuck closed or there may be a short in the wiring harness connected to the switch. Testing continuity across the switch terminals will confirm whether the contacts are releasing properly.

  4. 04

    Wiring fault in EHH switch circuit

    Part replacement

    A pinched, damaged, or shorted wire in the circuit between the EHH switch and the control board can falsely signal a closed switch state. Inspect the wiring for visible damage and test for unintended continuity to ground or between terminals.

See the test procedure for each cause

Frequently asked questions about EH

What does EH mean on a Goodman air_conditioner?
EH stands for Emergency Hydronic Engaged on a Goodman air conditioner. It means the Emergency Hydronic Heating switch (EHH) is in the closed position, which causes the control board to shut off the compressor. This is a deliberate operational mode designed to allow a backup hydronic heating system to take over. It is not a malfunction code but a status indicator tied to a physical switch.
How do I fix the EH code on my Goodman air conditioner?
To clear the EH code, locate the Emergency Hydronic Heating switch on the front of the unit and open it, meaning move it to the off or open position. Once the switch is open, the compressor lockout is released and normal operation should resume. If the code persists after opening the switch, the switch contacts or the connected wiring may need to be inspected and tested for continuity.
Is the EH code on a Goodman unit a safety issue?
The EH code itself is not a safety hazard. It is a control function that disables the compressor while a hydronic heating source is active, which is intentional design behavior to prevent simultaneous system operation. However, if the code appears unexpectedly and the hydronic heat is not actually needed, leaving it unaddressed means the air conditioning compressor will remain off, reducing comfort and system functionality.
Will resetting the unit clear the EH code on a Goodman air conditioner?
A simple power reset will not permanently clear the EH code if the EHH switch remains in the closed position, because the control board will detect the closed switch state again at startup and re-engage the lockout. The code will only clear reliably when the EHH switch is physically opened. If the switch is already open and the code still returns after a reset, there is likely a wiring or switch contact issue that needs further diagnosis.
How much does it cost to repair a Goodman air conditioner showing the EH code?
If the EH code is simply caused by the EHH switch being in the closed position, there is no repair cost since opening the switch resolves it immediately. If the switch itself has failed with stuck or shorted contacts, replacement switch parts and labor costs could range from around 50 to 200 dollars depending on the specific component and local labor rates. A wiring repair, if needed, would fall in a similar range depending on the extent of the damage.

Related Goodman air conditioner codes

All Goodman air conditioner codes
View all 27 Goodman air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass