Rittal – Error Code LH

Rittal – Error Code LH

Is your Rittal air conditioner showing up with Error Code LH on the screen?

What is a Rittal Error Code LH?

The “Error Code LH” on your Rittal air conditioner indicates that there’s minimal heat loss inside the enclosure, meaning the temperature inside is not being maintained as expected, possibly because the equipment inside isn’t generating enough heat or the cooling is too effective. This can affect the optimal operation of your equipment.

Recommended solution/fix steps

To fix this issue, follow these steps:

1. Check the Internal Load: Ensure that all equipment inside the enclosure is functioning correctly and generating the expected amount of heat.
2. Adjust Thermostat Settings: If possible, adjust the thermostat settings on your air conditioner to a slightly higher temperature to reduce cooling.
3. Inspect for Overcooling: Make sure the air conditioner isn’t cooling the enclosure more than necessary. You might need to reduce its cooling capacity or operational time.
4. Seal Leaks: Ensure there are no leaks or open spaces in the enclosure where warm air can escape or extra cool air can enter.
5. Consult the Manual: Refer to your Rittal air conditioner’s manual for specific instructions related to the LH error code and follow any additional troubleshooting tips provided.
6. Contact Support: If the problem persists, it may be best to contact Rittal support for professional advice or service to ensure your system operates optimally.

Troubleshooting to try

• Check for a dirty air filter
• Check your thermostat settings
• Check your air conditioner circuit breakers
• Check your outdoor unit
• Check all air vents

How to restart/reset/reboot your Rittal air conditioner?

You may find your Rittal air conditioning unit needs resetting if it starts to malfunction or isn’t responding to any input via your control panel or remote control. Resetting your air conditioner re-starts the internal computer and can often restore the unit to normal working order. The exact instructions will vary depending on your model of Rittal air conditioner. To reset your controller, press buttons 1 and 3 together, at the same time, for five seconds.

Typically, this procedure will be:

1. Turn off the air conditioning unit on your thermostat
2. Power off your air conditioning unit
3. Locate the reset button
4. Press the reset button for 5 seconds
5. Turn your air conditioning on using the thermostat

Rittal Maintenance

During normal air conditioner operation, dust, dirt, moisture from humidity or condensation, and microbial growths can build up on internal components. Left unchecked, these issues can corrode components like the evaporator coil and condenser coil. Over time, those components can become less effective and lead to a loss of efficiency or worse, a shorter air conditioner lifespan.

Regular AC maintenance and tune-ups can minimize many of the issues caused by a build-up of dirt and debris. If they are performed by an HVAC technician, these inspections allow your contractor to check for longer-term issues and in some cases take proactive steps to prevent premature failure or inconvenient breakdowns during the cooling season.

Annual air conditioner preventative maintenance may also be a requirement to keep your warranty valid as well. Many manufacturers state on warranty documentation that installation and maintenance by a licensed HVAC service provider are a part of the warranty conditions.

Cleaning your Rittal Air Conditioner

One simple way to potentially save money and prolong the life of an AC system is to make sure the outdoor unit stays clean. During normal operation, a fan in the outdoor unit pulls air through the condenser coil. Airborne dust and dirt particles and debris from nearby foliage can get lodged in the coil fins, restricting airflow and affecting performance.

Change or clean the air filters

The most important maintenance task that will improve the efficiency of your air conditioner is to routinely replace or clean the air filters. Replace one-inch pleated filters once a month. If you’re unsure of the type of filter to use, your Rittal Dealer can recommend one based on your specific system. For all other filter sizes, your Rittal Dealer will check, clean, or replace them at your annual maintenance visit. Remember, filters may need more frequent attention if your air conditioner is in constant use, is subject to dusty conditions, or you have pets in the house.

Clean the external unit

• Turn off the power
• Remove the front panel and remove any large debris you find in the case
• Use a vacuum cleaner with a soft bristle nozzle to remove dust from hard-to-reach places. Be careful not to damage parts – many components can bend easily
• Unscrew the grille on top of the Rittal air conditioner. The fan usually rises with the grille, so be careful not to damage the electrical connections
• Wipe the fan with a clean, damp cloth
• Clean the condenser – it has a smooth, flat surface, so the process will not take long and will not be complicated
• Assemble the unit. Return the fan and grille to their original position and screw them back onto the unit
• Leave the unit off for 12 to 24 hours

Remove debris from the unit

Over time, things like leaves, dirt and grass clippings will build up on the outside of your air conditioner, decreasing system capacity and reducing airflow. You should trim any shrubs or other plants back from around the air conditioner to keep from impeding airflow to and from the unit.