Welcome to the future of home heating

Here you can find support and helpful advice on making the most of your heat pump.

Constantine with heat pumps

5 top tips for getting to know your heat pump

1. It'll adjust to the weather automatically

To help you save energy, we set your heat pump to monitor how hot or cold it is outside, and adjust the temperature accordingly.

2. Heat pumps take longer to warm up

Your heat pump uses cooler water to heat your home, so it will take longer to warm up. You won’t feel an immediate difference like you might be used to with a boiler. It’s best to set your heating to come on before you get home or wake up. The preheating time will depend on your home, so you may need a few trial runs to find the perfect schedule.

3. Hot water always takes priority

When it’s time to heat your hot water tank, your heating will switch itself off. When the tank’s ready, the heating will turn itself back on. You don’t need to do anything and you shouldn’t notice too much of a difference in your home’s temperature.

4. It’s better to turn the thermostat down than turn the pump off

Your pump is much more efficient when it’s running consistently. Don’t want the heating on when you’re out? Turn down the thermostat by around 3 degrees. Or if you’re away for longer, use holiday mode in settings to turn your heating off without allowing the temperature drop too low. If you’re on a smart tariff you can save money by scheduling your water to heat at off-peak times when electricity is cheaper.

5. Keeping the area around your pump clean and clear helps it work well

The box needs room to breathe, so don’t pile the garden furniture or pots nearby. It also helps to clean off any leaves or dirt, and brush away snow. If you fancy a spring clean, you can give it a wipe down with a damp cloth, but steer clear of harsh chemicals, and avoid touching the fins at the back to protect your hands and the heat pump.


How to save energy and money

Begin by following the points below to get up & running cost-effectively with your new heating system.

Then to help boost your efficiency and cut your heating costs, we've put together a full guide including efficiency advice and schedule examples that you can tailor to your lifestyle. Find the guide below:

  • Get the app

The easiest way to control your heat pump is from the Daikin Onecta app. Set your schedule and temperature from wherever, whenever. Download from your app store, or find it here.

  • Keeping a steady temperature will save you money

Avoid turning up the comfort target temperature by more than a couple of degrees to keep your heating running efficiently. Stick to a target temperature that suits your comfort and budget, and your heat pump will adjust to the weather outside. Check out this guide for tips on the most affordable ways to run your heat pump.

  • Set a schedule

Turning your heat pump on and off will use more energy than setting a schedule in advance - your heating is designed to keep ticking away efficiently when it’s scheduled to be off, without cooling completely. It’s best to avoid turning your heat pump off completely unless you’re away for a few days or more. How to set a schedule.

If you’re on a tariff that has peak and off-peak times, try setting your heating and hot water for when you’re paying the lowest rates to save more money. Find recommended schedules here.

  • Go easy on the hot water boost (aka Powerful Operation)

It’s a handy shortcut when you need to reheat the tank quickly. But it’s not the most efficient way to use your system. So save it for when it’s really needed.

  • Choose a smart tariff

With a smart tariff like Cosy Octopus, you can heat your water cylinder at the cheapest and greenest times, saving you money with smart energy usage.

Choosing the right tariff

Heat pump run costs can vary from home to home, and can cost about the same or more than a gas boiler on a standard variable tariff. However our data has shown that you could unlock savings by choosing a smart, green heat pump tariff like Cosy Octopus.

We took the data from each of our Cosy Octopus tariff customers for a full 12 months and found that, on average, they saved 20% on their electricity bills compared to our standard Flexible Octopus tariff. Find further details here.

If a heat pump isn't your only low carbon tech device at home, you might find that a different smart tariff is the best fit for you. Check out the options below.

Cosy Octopus Designed especially for heat pump owners, Cosy Octopus gives you double dip Cosy Hours every day: six hours of super cheap electricity to warm your home.
Octopus Flux If you also have solar panels and battery storage, charge your battery or heat your home when it's cheap and get paid extra to export during peak hours.
Intelligent Octopus If you have an EV, Intelligent Octopus provides six hours of smart car charging and heat pump power every night at a guaranteed super low rate.
Agile Octopus Half-hourly electricity prices that update daily based on wholesale costs. Take advantage of plunge pricing. Ideal for those able to shift their energy usage regularly.
heat pump fix

Troubleshooting: quick check

Why is the outdoor unit smoking or dripping?

It’s most likely defrosting. When it’s cold, your pump will automatically run a cycle to clear any built-up ice . It’s actually steam, not smoke, and a bit of melted ice. So it might look a bit dramatic, but it’s actually a sign everything’s working as it should be.

Why aren’t my radiators hot?

The radiators will still be warming up your home even if they’re not very hot to touch. If your room is comfortable and the thermostat is the right temperature, then everything’s working fine – even if the radiator is lukewarm or cool. When it’s very cold outside, you’ll notice your radiators get warmer.

If the thermostat looks right but the room still feels a bit chilly, you could:

  • change the heating schedule, so it’s warm at different times
  • turn up the target temperature by a degree or two
  • open the valves and check the system pressure

Why is it showing an ‘AH’ error?

The short answer is that it didn’t finish disinfecting the hot water in the tank. Leave it a week, and it should run another cycle and clear the error. If it hasn’t by day 8, give us a call.

The long answer: once a week, your hot water cylinder runs a disinfection cycle. That should happen some time when you’re unlikely to run the hot water, like in the early hours. But if someone, say, runs a bath during that time, it stops the process. And that shows up as a warning until it runs the next cycle. Don’t worry: skipping a week won’t cause any problems.

How to reconnect your heat pump to Wi-Fi

If you've changed Wi-Fi router or internet provider, and your Daikin app has been disconnected from the internet, follow the steps on this guide to re-establish your Wi-Fi connection and get your heat pump back online.

heat pump house

If things still don’t look quite right

Most issues can be fixed with a little heat pump TLC (maybe the radiators feel colder at the top, or your hot water isn’t as hot as you’d expect). In this section we'll explain how to tackle this by:

  • Opening the radiator valves and bleeding the radiators
  • Checking and adjusting the water pressure in your heat pump

Looking after your radiators

There are two simple things you can do to keep your radiators in good nick and make sure your heating levels stay stable.

1. Open the valves

A lot of radiators have thermostatic valves, so you can regulate the heat in each room. They’re very handy, but they can get stuck sometimes.

All you need to do is turn them all the way in each direction before setting them back to where you want.

2. Bleed any air out of the radiators

You’ll know for sure they need it if they’ve got cold spots at the top. You’ll need a radiator key and a rag or cloth.

Pop the key in the valve and turn it slowly anti-clockwise, holding the cloth underneath, until you hear air hissing out. Hold there until a bit of water spits out (that’s what the cloth is for). Then close the valve again firmly, turning clockwise. Check out this video for a demo.

If you’ve had to bleed your radiators, it’s quite likely your water pressure has dropped. So check that next.

Checking and adjusting water pressure

Your heating system relies on water being at a certain pressure to work efficiently. Over time, the pressure can ease down, like air from a car tyre. It can also be affected if you change anything, like bleeding the radiators. Here’s how to keep it in good shape:

1. Make sure the system is cold before you start

Switch off the heat pump, and let the pipes cool down.

2. Check the cold water pressure

There’s a pressure gauge attached to the pump, or you can use the control panel. When the system is cold, the pressure should be between 1 and 1.5 bar.|

3. If it’s lower than 1 bar, top up the system with water

This is the hands-on bit. When you look at the heat pump, you’ll see a section with either a lever or flat-headed screws at either end of a flexible, braided hose. This is your filling loop.

4. You’ll need to turn the levers or screws slowly to let water into the system. Two things to remember:

  • Make sure the pump’s off and the water in the system is cold
  • Turn the levers or screws one at a time

They only need a quarter-turn. Keep your eye on the pressure gauge as the water is flowing in.

As soon as the gauge reaches 1 bar, shut the levers or screws off again. You don’t want the system pressure going too high.

Note: when your pump is on and the water is hot, you might see a higher pressure. That’s nothing to worry about: it goes up and down a bit while it’s working. But if the cold water pressure falls lower than 1 bar, the system won’t work as well as it should.

What if I’ve done all that, but my heating still isn’t hitting the right temperature?

It might be that the ‘leaving water’ - that is, the water circulating through your radiators and/or underfloor heating - is too cold. You can change that in the control panel settings. See this video for a guide.

  1. Scroll through the main menu and choose ‘main zone’.
  2. Use the right hand dial to raise the temperature slightly and press the left hand dial to confirm.

Still feel like something’s not right?

The quickest and easiest way to get hold of us is to drop a line to aftercare@octoes.com. We answer emails 7 days a week, so we’ll get back to you asap. You can also ring our freephone helpline on 0808 175 1696, open 8am – 8pm Monday to Saturday, 10am - 6pm Sunday. There are other ways to get in touch too.

If you'd like to make a complaint, contact our help team at heat@octopus.energy. Or find our complaints procedure here.


Video Guides

Here you can find straightforward guidance on how to use your heat pump controls. If you can't find what you're looking for, stay tuned as we have more videos on the way. In the meantime, get in touch for extra support.

How to use your thermostat

How to set a schedule with your Daikin control panel


Help offline

Get to know your heat pump

Download our guide to help you get the most out of your heat pump offline. Download

The best ways to run your heat pump guide

Your heat pump service plan
Get solar panels & battery storage
Spotlight on our green heating experts

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