How To Reset A Geothermal Unit (Different Brands)

Geothermal HVAC systems present a neat solution for regulating the temperature in your home. They are built in anticipation of fault-triggers from an unstable environment, which causes them to lock. Knowing when and how to reset them can be daunting, as the faults may still be operative.

How to reset a geothermal unit is a straightforward process that is often managed automatically by the machine in response to certain triggers. For other cases, manual reset involves removing power from critical components, pausing, and then reintroducing the power. Specifics vary by manufacturer.

To know exactly how to reset your machine, refer to the list of instructions we have for leading brands. The instructions for your particular device are likely to be similar, if not exactly the same.

Geothermal Unit in log hut

Reset Instructions For Leading Geothermal Brands

The series below are amongst the top efficiency-rated brands by Energy Star. Search for your model, which is likely to be in one of the series. For each brand, reset instructions are provided.

Bosch Greensource

These units have intelligent reset, which takes the guesswork out of when to intervene. A user is required to manually intervene only in certain instances where a hard lockdown has been triggered.

Intelligent Reset:

On autodetecting fault condition, the unit initiates a 5-minute delay on break time. It restarts after the expiry of this period. The fault LED will flash the cause of the fault during the delay.

The lockout dip switch has a prior setting of 2 or 4. Should the fault persist or, within sixty minutes, occur the number of times indicated on the lockout dip, the unit will enter a hard lockout, requiring a manual reset.

A hard lockout will also be triggered on the first instance of a condensate overflow.

Manual Reset:

To recover from a hard lockout, refer to the “RESET” dip switch. When the switch is set to “Y,” turn the thermostat off and then back on. When the switch is set to “R,” shut off unit power at the circuit breaker.

Bryant Evolution

There is no need to restart if the heat pump displays a green light. If the pump displays an orange or red light, a reset is required:

  1. Turn the thermostat off.
  2. The heat pump’s power switch is located either at the edge of the heat pump or on the adjacent wall. Turn off this switch.
  3. There are two electrical breakers serving the heat pump. Turn both off.
  4. Wait five minutes.
  5. Bring the system up by switching components on in reverse order:
    1. Turn the two circuit breakers back on.
    2. Switch the heat pump power switch back on.
    3. Turn on the thermostat.

Carrier GC Series with Infinity Thermostat

  1. Hold down the button beside the left arrow until the screen displays “Accessory Status.” This will last several seconds. The screen will display the names of accessories.
  2. Use the “Scroll” button to page through the accessories. Abbreviated descriptions occur for each item. Choose one, e.g., “Hum Pad,” for the humidifier pad.
  3. Reset the chosen application by pressing the button beside the right arrow.
  4. Cycle through the remaining applications by repeating steps 2 and 3.
  5. Press (don’t hold) the left arrow button to exit the “Accessory Status” screen.

ClimateMaster Series with iGate Controls

All equipment factory settings can be restored. This will not affect user settings, which will remain unchanged. To reset everything, including user settings, select “Reset All Settings.”

To reset the unit:

  1. Connect the thermostat.
  2. Select “Meni” on the “Home” screen.
  3. Select “Settings” and then “Reset.”
  4. Select “HVAC Equipment Settings” and then “Yes.”

Hardware Reset:

In exceptional circumstances, the operation of the thermostat may be interrupted by power surges or static electricity. This forces a hardware reset.

You may reboot the thermostat by pressing the hardware reset button, accessible through an opening on the corner at the thermostat’s bottom left. The programming or configuration options will not be altered by a reboot.

GeoComfort Guide Series With Core Display

Intelligent Lockout Reset:

  1. Power the thermostat off for one minute.
  2. Power it back on (this is called a “soft reset”).

Disruption of power to the board will cause the fault memory to be reset.

Voltage faults trigger the initiation of a fault and a shutdown of the compressor. All four-fault LEDs will flash, and the “Call For Service” indicator will illuminate. An automatic reset will be triggered, and the lockout condition will not be entered.

GeoSmart Eco With Premier Control

Lockout Conditions:

When the unit enters lockout mode, the relevant lockout LEDs will illuminate on the unit and thermostat. The accessory outputs and compressor will be de-energized. Emergency heat operation will be triggered if the thermostat requires heating.

To reset all other lockout modes:

  1. Turn the unit off.
  2. Wait five minutes.
  3. Turn the unit on.
  4. Confirm illumination of the unit lockout LED.

Lockout LEDs will be cleared following a power interruption. A lockout can be reset through one of the following methods:

  1. Turning off power at the controller.
  2. Issuing a reset command from the BAS.
  3. Simultaneously press the Return and Esc keys from the MUI for five seconds.

GeoStar With Aurora Control

  1. The SYSTEM button is located on the thermostat. Push it repeatedly until the display reads OFF.
  2. After turning off the system, the lockout indicator will remain on for up to fifteen seconds.
  3. After the lockout indicator turns off, the unit may be restarted in the desired mode.
  4. Wait five minutes for the operating of the unit to resume.
  5. As a diagnostic guide for the repair technician, the fault indicator LED will continue to flash until power is interrupted.
  6. Refrain from repeatedly resetting the machine. If the error recurs, call a technician.

Modine With Modine Control

The unit is primed to automatically reset within an hour. To manually reset from a lockout condition, remove power from the control for more than 1 second. Alternatively, remove the thermostat that calls for heat. Reinstate the thermostat call between one and twenty seconds later.

In the case of a hard lockout, the unit will respond to detected faults on the control board. The control will lockout, with the status LED reflecting a de-energized status. This will persist for the duration of the fault. On clearance of the fault, the unit will automatically reset from a hard lockout condition.

Trane With Premier Control

The thermostat cannot be used to reset Comfort Alert. To reset all other modes:

  1. Turn the unit off.
  2. Pause for five minutes.
  3. Turn the unit back on.

Throughout, the LED unit will remain illuminated. A power interruption will cause a lockout condition to be reset without a waiting period. It will clear all lockout LEDs.

Waterfurnace/York Affinity With Aurora Control

  1. On the thermostat, locate the SYSTEM button. Push it until the display registers OFF.
  2. Confirm that the unit lockout indicator light still is on.
  3. Wait for the lockout indicator to turn off. This might take 15 seconds.
  4. Turn the system on to the mode required.
  5. Wait five to six minutes for the unit operation to resume.
  6. Avoid perpetual resets if the problem persists. In that case, call a dealer.

Resetting Other Brands

If your unit is not listed above, refer to an owner/operator manual. This can be obtained either by searching online, mailing the equipment manufacturer, or calling a reseller or technician. It is advisable to have a manual at hand before problems arise.


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