Button combinations: Heat Pump tips

Short, practical technician tips on button combinations for heat pump. Check each one against the manual for your exact model before acting.

Recall the stored error on the indoor lamps

Fujitsu · Fujitsu ductless heat pumps: Fujitsu wall-mounted KMCG (ASEH07-14KMCG / AOEH07-14KMCG)

The indoor unit keeps the last error in memory through a power cut and shows it on the OPERATION, TIMER and ECONOMY lamps during the start-up wait.

1. Stop the unit, remove power, then switch power back on.
2. During the 2 minute 20 second start-up wait, run the unit and press TEST RUN on the remote, or keep MANUAL AUTO pressed on the indoor unit for at least 10 seconds.
3. Read the lamp flashes against the error table.
4. To erase it press MANUAL AUTO while the memory is shown (short beep for about 3 seconds).

Read live running parameters of an outdoor module (function n7)

Gree · Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))

Shows parameter codes such as outdoor ambient, compressor frequency and pressures for a chosen module.

1. Hold SW2 on the master for over 5 seconds, select n7 and confirm with SW3.
2. Pick the module with SW1 and SW2 and confirm with SW3.
3. Pick the parameter code with SW1 and SW2.
4. Four-digit temperatures show as two pairs, for example 01 then 15 for 115 degrees; a negative reading is introduced by nE.

Read or clear the fault history (function n6)

Gree · Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))

Shows the last five faults with module address; 00 means no more entries.

1. Hold SW2 on the master for over 5 seconds to open the query menu.
2. Select n6 with SW1 and SW2, confirm with SW3.
3. Step through entries with SW1 and SW2; 00 ends the list.
4. Hold SW3 for over 5 seconds to clear the history.

View the stored malfunction code on the remote (LIGHT x6)

Gree · Multi21+ 18-24k multi-zone (MULTI..HP230V1CO)

Pressing the LIGHT key 6 times within 3 seconds shows the malfunction code on the indoor display.

1. Press the LIGHT key on the remote 6 times within 3 seconds to start viewing.
2. Repeat the 6 presses within 3 seconds to stop, or wait 5 minutes for it to end by itself.

Read the error history with the wired remote self-check

Mitsubishi · Mr. Slim PEAD-RP JA(L) ducted indoor units with PAR-21MAA wired remote

Shows the stored check codes on the wired remote LCD; use it to read the last fault, not to run the unit.

1. Turn the power on.
2. Press the CHECK button twice.
3. If system control is used, set the refrigerant address with the TEMP buttons.
4. Read the check code on the LCD.
5. End the self-check with the ON/OFF button.