Daikin E7-00 Fault Code: Causes, Fixes & Repair Costs
What does the Daikin E7-00 fault code mean?
The E7-00 fault code indicates that the outdoor unit's fan motor system has detected a problem and stopped working normally. The outdoor fan is essential to the heat pump's operation — it draws air across the outdoor coil so the refrigerant can absorb heat from the air (in heating mode) or reject heat to the air (in cooling mode). When the E7-00 appears, the heat pump will lock out and cease to operate in either mode until the fault is resolved.
General guidance only — not a substitute for professional advice, and not certified by an heat pump engineer. Always have your specific appliance assessed by a qualified professional. Any heat pump work must be carried out by an MCS-certified heat pump engineer. If you notice a refrigerant leak, a burning smell or water leaking from the unit, switch it off at the isolator and call an MCS-certified heat pump engineer. Refrigerant work must be carried out by an F-Gas registered engineer.
Common causes
- Foreign object or debris obstructing the fan Common
Leaves, twigs, litter, compacted ice or even small animals can become lodged in the outdoor unit and physically prevent the fan blade from spinning. The motor protection circuit detects the blockage and raises E7-00. This is the most straightforward cause to check and rule out before anything else.
- Fan motor failure or seizure Common
Over time the fan motor bearings wear, the windings degrade, or the motor simply burns out — particularly on units that are more than five to eight years old or that have been subject to repeated fault-run cycles. A seized or electrically failed motor will not spin at all after a reset, and E7-00 will return within seconds of restart.
- Cracked or unbalanced fan blade Sometimes
Daikin outdoor fan blades are moulded from plastic and become brittle after years of UV exposure and temperature cycling. A cracked or distorted blade creates vibration and imbalance that overloads the motor windings, causing the motor protection circuit to trip and log E7-00. The blade may still appear to rotate while the damage is subtle enough to miss at a glance.
- Wiring or connector fault between the fan motor and outdoor PCB Sometimes
The harness and connectors linking the fan motor to the outdoor unit's control board can develop loose connections, corrosion or chafing damage — especially where the wiring runs close to a sharp edge or vibrating component. An intermittent connection here can cause the motor to behave erratically and trigger E7-00 without any obvious mechanical fault.
- Defective outdoor unit PCB Rare
If the outdoor unit's main control board has a failed driver circuit or damaged component, it may be unable to correctly power or monitor the fan motor, producing an E7-00 fault even when the motor itself is in good condition. This is typically diagnosed by an engineer only after the motor, blade and wiring have all been ruled out.
How to fix it
- Switch off and perform a single power reset DIY safe
Turn the heat pump off at the wall isolator or consumer unit MCB, wait a full five minutes to allow the control system to fully discharge, then restore power. Watch the outdoor unit for the first 60 seconds — the fan blade should begin to spin up smoothly. If it does not move at all, stutters and stops, or E7-00 reappears immediately, you have a hardware fault that no further resets will resolve. Limit yourself to one or at most two reset attempts; repeatedly resetting through a live mechanical fault can cause additional damage to the system.
- Safely inspect around the outdoor unit for obstructions DIY safe
With the unit powered off at the isolator, walk around the outdoor unit and look through the fan grille for leaves, twigs, compacted debris or ice. Remove anything you can see using your hands or a soft brush — do not insert anything through the grille or attempt to spin the blade manually. Also check that no vegetation has grown in to restrict airflow around the unit; clear at least 30 cm of clearance on all sides. If you find and remove an obvious blockage, perform the power reset described above and monitor whether the fan runs freely.
- Check system pressure on the buffer/heating circuit DIY safe
While you have the system off, glance at the pressure gauge on the heating circuit (usually on the indoor unit or buffer vessel). A healthy system typically reads between 1.0 and 2.0 bar. If pressure is low, top it up via the filling loop according to your installer's guidance. Low system pressure is not the cause of E7-00 but is worth correcting at the same time so the engineer has an accurate picture of the system's condition on arrival.
- Do not attempt to run the heat pump with a known fan fault DIY safe
Operating the heat pump while the outdoor fan is not working correctly will cause refrigerant pressures to move dangerously out of their normal range. This can trigger additional fault codes and, over time, cause compressor damage — turning a relatively straightforward fan motor repair into a far more costly job. Leave the unit off until an engineer has assessed it.
- Arrange inspection and repair by an MCS-certified heat pump engineer heat pump engineer
A qualified engineer will use a multimeter to test the fan motor windings for continuity and insulation resistance, check and reseat the motor-to-PCB connector harness, inspect the fan blade for cracking or imbalance, and test the outdoor unit PCB's fan driver circuit. If the fan motor or blade needs replacing, this is a straightforward mechanical repair that most engineers carry common parts for. If the PCB is at fault, it will need to be sourced and swapped. Before booking a repair, check your documentation — Daikin Altherma units installed by a Daikin-registered (D1 or D2) engineer carry a five-year parts and labour warranty when registered within 30 days of installation; a warranty repair through Daikin's own engineer network will cost you nothing.
Parts you may need
- Daikin outdoor unit fan motor · from £180
- Daikin outdoor fan blade (propeller) · from £65
- Outdoor unit main PCB (control board) · from £320
- Fan motor wiring harness / connector · from £35
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £250–£550, depending on the underlying cause.
Frequently asked questions
Can I fix the Daikin E7-00 fault myself?
The only homeowner-safe actions are clearing visible debris from around the outdoor unit, performing a single power reset, and checking that no MCB has tripped. If the fault clears after removing an obstruction, great — but if E7-00 returns after a reset, the repair requires a qualified engineer. The fan motor, blade, wiring harness and PCB all sit inside the outdoor unit and should only be worked on by an MCS-certified technician.
How much does it cost to fix a Daikin E7-00 in the UK?
For the most common causes — fan motor replacement or a wiring fix — most UK homeowners pay somewhere between £250 and £550 all-in, covering call-out, labour and parts. A cracked fan blade on its own is cheaper, often £150–£250 fitted. If the outdoor PCB turns out to be the culprit, costs typically rise to £500–£800. Compressor damage caused by running the unit with a failed fan for an extended period can push the bill well above £1,000, which is why it is important not to keep forcing the system on when E7-00 is active. Always check whether your unit is within its warranty period before paying for any repair.
Why does my Daikin heat pump show E7-00 only in cold or icy weather?
In very cold conditions the outdoor coil can ice up to the point where ice physically contacts the fan blade or the defrost cycle creates enough meltwater to splash into the motor housing. The E7-00 fault triggered by ice is usually intermittent — it may clear once temperatures rise. However, if your unit is icing up excessively in normal winter conditions, that suggests a separate underlying problem (low refrigerant charge, a defrost sensor fault, or blocked airflow) that an engineer should investigate. F-Gas registered engineers are required for any work involving the refrigerant circuit.
Will my Daikin warranty cover an E7-00 repair?
It depends on the cause and when the unit was installed. Daikin Altherma heat pumps installed by a Daikin D1 or D2 registered engineer come with a five-year parts and labour warranty, provided the unit was registered on the Daikin website within 30 days of installation and has been serviced annually. If your unit is within that window and the fan motor failure is a manufacturing defect rather than impact damage or lack of maintenance, Daikin's own engineer network should handle the repair at no charge to you. Check your installation paperwork or call Daikin UK's customer line before booking an independent engineer.