Mitsubishi Ecodan servicing by certified heat pump engineers
Servicing your Mitsubishi Ecodan heat pump regularly is essential to keep it running efficiently and to maintain your manufacturer warranty. At Alto Energy, our experienced engineers carry out professional Mitsubishi heat pump servicing across the UK, with a detailed system check and full service report provided after every visit.
Whether you have an air source heat pump in a new build or a retrofit installation in an older property, we offer expert support tailored to your heat pump setup. All work is completed by trained engineers with extensive experience in Mitsubishi Ecodan systems.
Book your Mitsubishi Ecodan service today, or get in touch for advice on servicing requirements in your area.
What’s Included in a Mitsubishi Heat Pump Service?
A heat pump service involves more than just a quick clean. It’s a full inspection of the system, carried out to keep everything running as it should. During a service, our engineer will carry out a series of checks to maintain performance and efficiency. This includes:
- Cleaning the outdoor coil and fan
- Applying a corrosion inhibitor coating to the outdoor unit
- Checking refrigerant pressures and circuit performance
- A full visual inspection of the system
- Electrical checks including voltages and current draw
- Checking and monitoring flow rates, kWh usage and heat output (COP)
- Ensuring the defrost cycle is operating correctly (in winter)
- Checking expansion vessels and inhibitor/glycol levels
- Testing thermostat functions and control settings
- Backflushing the outdoor unit if needed
- Bleeding radiators and checking for airlocks
- Recording efficiency data and checking consumption levels
Common questions about Mitsubishi heat pump servicing
We recommend an annual service to keep your system working efficiently and to stay within Mitsubishi’s warranty terms.
We check the heat pump’s operation, inspect all key components, assess system pressures, and carry out any cleaning or adjustments required. You’ll receive a full report after the service.
It’s best to use qualified engineers with Mitsubishi Ecodan experience. Our team are heat pump specialists and service systems in line with the manufacturer's guidance.
Yes, our engineers provide Mitsubishi heat pump servicing across the UK. Just let us know your postcode and we’ll confirm availability in your area.
Mitsubishi heat pump fault codes and what they mean
If your Mitsubishi Ecodan heat pump has stopped working and a fault code has appeared on the screen, you’re not alone. These systems are very reliable, but like any piece of technology, they can flag up issues now and again.
Here’s a breakdown of some of the most common Mitsubishi fault codes and what you can do about them.
Mitsubishi Ecodan L9 fault code
This is one of the more common alerts and usually points to a problem with water flow around the heating circuit. In most cases, the system isn’t getting enough flow, which could be caused by:
- A blocked filter
- Low water pressure
- A circulation pump not running
If you’re comfortable checking your system pressure, it’s worth a look. Otherwise, or if you’re unsure what to do, contact our technical support team for expert guidance.
Mitsubishi Ecodan E6 fault code
This code appears when there's a communication issue between the outdoor and indoor units. It can happen after a power cut or when one unit has been switched off independently of the other.
Most of the time, it can be resolved with a simple reset. Try turning both units off completely, wait a couple of minutes, then switch them both back on at the same time.
If that doesn’t work, it’s best to get in touch with our technical support team.
Mitsubishi Ecodan P1 fault code
This error usually means the controller is expecting a temperature reading (called a thermistor signal) but can’t detect one. This might be due to:
- An incorrect setup or sensor setting
- A recent change to the system that needs further configuration
This type of issue needs to be looked at by someone with a good understanding of your system setup. If you’re not sure where to start, our technical support team is here to help.
Need more help?
If you’re unsure about any of the above or your Mitsubishi heat pump is showing a different fault code, it’s always a good idea to speak to a our technical support team, who are here to help you get back up and running.
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