Hitachi Air Conditioner: Complete Troubleshooting Guide

How to Diagnose Hitachi AC Incorrect Temperature Settings (Cooling Mode)
Simply check your Hitachi AC thermostat to notice the current mode that the AC is operating on and adjust it to the COOL mode with Hitachi AC White Light Blinking.

How to Fix Hitachi AC Incorrect Temperature Settings (Cooling Mode)

Use the function selector button to move between the different operation modes until you can select the COOL or AUTO mode as desired. If you choose the COOL mode, set your desired temperature using the increase and decrease options of the TEMPERATURE button until you can see the desired temperature on the display screen.

Dirty Air Filters

A dirty air filter is the most common cause of inefficiency in your cooling system. Luckily, it is also easy to resolve.

The Hitachi AC manufacturer recommends that you clean your AC’s air filter every 15 days. If you don’t clean your filters regularly, you’ll likely experience some of the following problems:

  • Poor airflow in and out of the unit.
  • Low cooling capacity.
  • A musty smell when the AC is on.
  • Overheating.
  • Increased energy bills.

How to Diagnose a Dirty Hitachi AC Air Filter

To check whether your Hitachi AC air filter is dirty, ensure that the indoor unit is turned off and open the front panel by holding both sides and allowing the panel to swing upwards. This reveals the filters and you can easily tell if they are covered with dirt. If that is the case, proceed to clean the air filters with Hitachi AC White Light Blinking.

Note that your Hitachi AC filter indicator lamp (green) will also come on when a dirty air filter is detected or your AC has run for 200 hours without cleaning the filter.

How to Clean a Dirty Hitachi AC Air Filter

Use these instructions from the Hitachi AC manufacturer to clean dirty air filters:

  • Switch off your Hitachi AC.
  • Hold the front panel with both hands from each side and allow the panel to swing upwards, then pull towards you to remove it.
  • Remove the air filters by pulling them towards you with Hitachi AC White Light Blinking.

Use a vacuum cleaner to remove the dust from the air filter and proceed to wash with a mixture of warm water and a little kitchen detergent, then rinse thoroughly as detergent left on the filter can make it deteriorate with time. Ensure the water is not warmer than 40°C (104°F) to avoid damaging the air filter.
Shake off the excess water from the filter and leave it to dry under the shade (never under direct sunlight).
Reinstall the dry filters back in place, ensuring that the ‘FRONT’ mark is facing front.
Replace the front panel and switch the AC back on to resume operation.
You can watch this quick video demonstration on How to clean the filter of a Split Air Conditioner by Hitachi. Note also that if your Hitachi air conditioner has a stainless steel-coated air filter, you can use the Auto Filter Clean Technology (iClean) feature on your remote control to clean the air filter automatically as shown in this video.

Dirty Outdoor Unit

A dirty Hitachi AC outdoor unit compromises airflow and the regulation of temperatures in the cooling process. Plant matter, dust, and other forms of dirt and debris can all stay on the way of air going in and out of your AC and block in heat, causing poor or no cooling inside your home.

How to Diagnose a Dirty Hitachi AC Outdoor Unit

How easily you can check whether your Hitachi AC outdoor unit is dirty will depend on its location. If the outdoor unit is on ground level, you can easily unscrew the top cover and look inside to notice dust and debris buildup. If the outdoor unit is installed on the wall of a high-rise building or apartment, you’ll require the services of an HVAC expert.

How to Clean a Dirty Hitachi AC Outdoor Unit

The outdoor Hitachi AC unit houses the fan, compressor, condenser coil, and electrical parts. Focus on the condenser and fan when cleaning your Hitachi AC outdoor unit and follow these steps:

Switch off the AC from the circuit breaker and wait 30 minutes for it to cool.
Unscrew the top cover of the outer casing, the air discharge grille, and the front panel in that order. This should reveal the condenser, fan, and electrical components.
Remove any loose plant matter and debris by hand while paying attention not to be cut by the coil fins.
Use a low-pressure hose to spray water on the fan and condenser coil. If there’s plenty of dirt on the fins, use a soft brush to scrub off stubborn dirt by making up and down strokes only. Ensure you do not bend any fins out of position as this will compromise airflow into the unit. Also, be careful not to send any water to the compressor or electrical parts. This could cause an electrical shock when the unit is turned back on.
Wash the panels of the outer casing and air grill while waiting for the condenser and fan to dry completely. You can also use a damp and soft cloth to dust inside the panels of the compressor and electrical compartment but stay attentive not to cause any damages.

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