Aira does not publish a public list of numbered error codes for its UK heat pump. Instead, faults show up in two places: as coloured light patterns on the indoor unit, and as alerts in the Aira Home Energy app. Aira also says the system monitors itself and reports problems to its own team.
So if you searched for an Aira error code, this guide covers what you can actually see: the lights, the app alerts and the everyday symptoms behind them. For codes on other makes, our heat pump error codes hub has the wider picture.
Most Aira owners have aftercare from Aira itself, so contact Aira Customer Care first, especially while the system is under warranty. If you are out of warranty, want a second opinion or the fault keeps coming back, we are independent F-Gas certified engineers and can book an Aira heat pump repair. Whatever you do, never open either unit: both contain mains voltage and pressurised refrigerant.
Is it safe to fix an Aira heat pump fault yourself?
Only basic checks are safe for a homeowner: anything beyond looking, clearing and reading the app belongs with an engineer. You can check the pressure gauge, clear leaves from around the outdoor unit and look at your consumer unit for a tripped breaker.
Never remove covers or touch wiring inside either unit. The refrigerant circuit is legally restricted to F-Gas certified engineers in the UK, and Aira's own advice on frost and pressure problems is to contact Customer Care if a simple check does not fix it.
Your warranty matters here too. Unqualified work can affect the cover Aira provides, so check before anyone touches the system.
Please read first: this guide is here to help you understand what your Aira heat pump is telling you. Every effort has been made to keep the information accurate, but manufacturers update their guidance and alerts and fault lights can differ between models and software versions, so always check the official Aira support pages for changes before acting on anything here. Do not attempt anything that could be dangerous, and avoid any work that could void your warranty. If in doubt, call a qualified heat pump engineer.
If your Aira heat pump is not showing a code, or you want to rule out the basics first, our guide to air source heat pump not heating or not working walks through the general checks and matches common faults to error codes across every major brand.
Which Aira faults can you check yourself?
With no numbered codes, your starting point is the symptom or alert in front of you. These are the ones with a realistic first check from outside the units.
| Light, alert or symptom | What it means | Safe homeowner check | Stop and call if |
|---|---|---|---|
| Frost or ice on the outdoor unit | Aira names restricted airflow, low refrigerant, dirty coils or a faulty defrost control | Clear leaves and debris from around the unit, as Aira advises. Never chip at ice | Ice persists or keeps building up |
| Low system pressure | Aira's maintenance advice lists this as a check when heating stops | Read the pressure gauge. Top up only if you have a filling loop and your handover pack allows it | It drops again, or topping up does not help |
| No heating | Aira has a support entry, but the published answer was not available to us | Check the app shows heating switched on and no breaker has tripped | Settings and power are fine but there is still no heat |
| Out of hot water | As above | Check the hot water schedule and boost setting in the app | The schedule is right and the water stays cold |
| Noise from the outdoor unit | As above | Look for leaves or debris near the fan grille | You hear grinding, squealing or loud knocking |
| Error shown in the app | Wording varies | Write down or screenshot the exact message | Always pass it to Aira Customer Care first |
If ice is your main worry, our guide to a heat pump frozen outside unit explains what normal frost looks like.
What are the most common Aira heat pump fault lights and alerts?
The signs Aira owners see most are red indicator lights, app alerts, frost on the outdoor unit and a drop in heating or hot water. Where we add causes Aira does not publish, we label them as general engineering knowledge.
Pulsating red light (centre or left side)
Aira's notifications support page lists a pulsating red light in the centre and one on the left of the indoor unit. We have not been able to confirm the published meaning of each, so we will not guess. From general engineering knowledge, red patterns usually signal an active alert: check the app, note what it says and call Aira Customer Care.
Pulsating blue or solid green light
Aira lists these patterns too, on their own or together. Their meanings are on Aira's support page and in the app rather than in any document we could verify. If you are unsure whether a light means a fault, ask Aira before doing anything else.
Error message in the app
The app can show an error, and the wording varies. Screenshot it, including the time, because that is exactly what Aira or an engineer will ask for. Our guide to heat pump smart controls explains more about app-based monitoring.
Frost and ice on the outdoor unit
Aira's freezing advice names restricted airflow, low refrigerant, dirty coils and faulty parts such as the defrost control. Clear debris and call Customer Care if it persists. General engineering knowledge adds that a blocked condensate drain can freeze at the base of the unit; some frost is normal, as our heat pump defrost cycle guide explains.
Low system pressure
Aira's maintenance advice says to check for low system pressure and contact Aira if that does not fix things. General engineering knowledge: a sealed heating circuit loses pressure through small leaks or trapped air escaping, which is a separate issue from refrigerant. See heat pump losing pressure for the usual culprits.
No heating or radiators cooler than before
Aira has support entries for both. From general engineering knowledge, lower flow temperatures are normal on heat pumps in mild weather, so cooler radiators are not always a fault. Sludge, scale, air locks and low pressure can all reduce output on any wet system, as our heat pump not heating article covers.
Water leaking
Water under the outdoor unit during defrost is normal. A steady drip from pipework or the indoor unit is not, and our heat pump leaking water guide helps you tell the two apart.
Noise
Aira has a support entry for noise. As general engineering knowledge, leaves or debris near the fan are a common harmless cause, while grinding or squealing needs an engineer. More in our heat pump making noise guide.
Which light or alert might you see in common situations?
Aira does not publish which light goes with which fault, so this table links each situation to the signs you are likely to notice and the first thing to check.
| Scenario | Lights, alerts or symptoms you may see | First check |
|---|---|---|
| Cold snap, iced outdoor unit | Frost or ice on the unit; possibly a red light or app alert | Clear debris from around the unit; never chip ice |
| Losing pressure or low pressure | No heating; possibly an app alert | Read the pressure gauge |
| Radiators lukewarm | Radiators cooler than before | Check the weather: mild days mean lower flow temperatures |
| No hot water | Out of hot water | Hot water schedule and boost in the app |
| After a power cut | Possibly an app alert or indicator light | Check breakers and that the app shows the system back online |
| Unit noisy or fan not spinning | Noise; ice around the fan | Look for debris or ice near the fan grille |
| After a service | Possibly an app alert | Ask whoever serviced it whether valves were reopened and pressure restored |
How do you reset an Aira heat pump?
Aira does not publish a reset procedure, and we have not been able to confirm a safe power-cycle sequence for its units, so we will not give one here. Aira's own route for faults is its Customer Care team, which it says is available 24/7.
Because the system reports to Aira remotely, its team may already see the fault before you call. Switching the unit off and on repeatedly does nothing to fix the cause, so leave resets to Aira or an engineer.
Aira fault light and alert list
There is no official Aira error code list, so this table lists the fault-related indicator patterns and symptoms Aira names, with who should deal with it.
| Light, alert or symptom | Meaning | Who should fix |
|---|---|---|
| Pulsating red light, centre | Listed by Aira; meaning not confirmed by us, check the app or Aira's support page | Aira Customer Care, then engineer |
| Pulsating red light, left side | As above | Aira Customer Care, then engineer |
| Pulsating blue light, solid green light, or both | As above | Aira Customer Care if unsure |
| Error in the Aira Home Energy app | Wording varies | Homeowner records it, then Aira Customer Care |
| Frost or ice on outdoor unit | Airflow, coil, refrigerant or defrost control problem | Homeowner check, then F-Gas engineer |
| No heating or low pressure | Pressure, power or settings issue | Homeowner check, then engineer |
| Out of hot water | Settings or system fault | Homeowner check, then engineer |
| Radiators cooler than before | Often normal in mild weather | Homeowner check, then engineer |
| Noise | Debris, or a mechanical fault | Homeowner check, then engineer |
| Water leaking | Defrost water is normal; a steady drip is not | Engineer |
Where can you find the official Aira manual?
Aira does not publish its UK user manual as a public download, so its customer support pages are the official reference, and Aira Customer Care is the route for anything they do not cover. These pages cover the indicator lights and routine maintenance.
Need help with an Aira heat pump fault?
Yes: if Aira aftercare has already been your first call, we can step in as independent engineers for Aira heat pumps across the UK. That is useful once your system is out of warranty, or when you want a second opinion on a fault that keeps coming back.
Our engineers are F-Gas certified, so they can diagnose and repair refrigerant faults as well as pressure, flow and electrical problems. We aim for same-day visits where possible, and every repair carries our 12-month guarantee. If you have no heating, our emergency heat pump repair service can prioritise you; otherwise book a heat pump repair.
Regular heat pump servicing heads off many of the pressure, airflow and frost problems above, and our cover plans are worth a look for ongoing support. See the heat pumps we work on, call 0333 041 5130 or contact us online.
Frequently asked questions
Why can't I find a list of Aira error codes?
Aira handles faults through its app, indicator lights and Customer Care team rather than a public code list. If the app shows a reference you do not understand, Aira can explain it. Be wary of websites listing "Aira codes" with no source.
Will an independent engineer affect my Aira warranty?
It can, depending on Aira's terms, which is why we suggest contacting Aira first while you are covered. Once the warranty has ended, or if Aira agrees, an independent F-Gas engineer can work on the system. Keep a record of every visit either way.
Does a red light mean the compressor has failed?
Not necessarily. A red light tells you something needs attention, and on most heat pumps the cause is often simpler, such as airflow, pressure or a sensor. Only a proper diagnosis will tell you whether the compressor is involved.
How long does an Aira heat pump repair take?
Many faults, like a pressure loss or blocked airflow, can be sorted on the first visit. Repairs needing specific Aira parts or refrigerant work may take longer while parts are sourced. You will get a clear timescale once the fault is diagnosed.
Should an Aira heat pump be serviced every year?
An annual service is good practice for any heat pump and can be a warranty condition, so check your paperwork. It catches pressure, airflow and frost issues before they trigger an alert. Our article on why heat pump servicing is important explains what you gain.
