An Ideal heat pump error code is a fault number the Logic Air system shows on its controller, with a bell icon at the top of the screen. Some codes stand alone, such as 127. Others come in two parts: fault 370 means the outdoor unit has a problem, and an F sub-code from F0 to F27 tells you what it is.
To see the full code, go to the control box on the cylinder and turn the wheel to the bar graph symbol to open the Info screen. This guide is about Ideal's Logic Air heat pumps, not its Logic boilers, which use a different code system. For other makes, see our guide to heat pump error codes.
Before you check anything, switch the outdoor unit off at its isolator and never open the casing. If a code comes back, or you are unsure what it means, book an engineer. We carry out Ideal heat pump repairs across the UK.
Please read first: this guide is here to help you understand what your Ideal heat pump is telling you. Every effort has been made to keep the information accurate, but manufacturers update their manuals and codes can differ between models and software versions, so always check the official Ideal manual 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 Ideal heat pump is not showing a code, or you want to rule out the basics first, our guide to common air source heat pump faults walks through the general checks and matches common faults to error codes across every major brand.
Is it safe to fix an Ideal heat pump fault yourself?
Only the simple checks are safe for a homeowner; anything inside the outdoor unit, cylinder or control box is for an engineer. Ideal's own user guide covers a few of these checks, such as topping up pressure and clearing leaves or snow.
Never remove panels or touch the wiring, boards or sensors, even when a code names a single thermistor.
Refrigerant work is legally restricted to F-Gas certified engineers, so pressure, compressor and discharge temperature faults are not DIY jobs. Work inside the unit by anyone unqualified can also affect your Ideal warranty.
Which Ideal error codes can you check yourself?
Ideal's user guide gives homeowner checks for four faults: 370 F27, 127, 60 and 65. A few others, such as airflow and outdoor connection faults, also have a safe first step.
| Code | What it means | Safe homeowner check | Stop and call an engineer if |
|---|---|---|---|
| 370 F27 | No water flow | Check the pressure gauge reads 1 to 1.5 bar. If it is below 1 bar, top up through the filling loop, as the user guide describes | The code stays after topping up, or pressure keeps falling |
| 370 F15, F17 | Airflow or fan fault | Clear leaves and snow from the outdoor unit by hand. Clean with a weak soap solution, never a pressure washer | The fan is iced in or will not turn |
| 127 | Anti-Legionella cycle did not complete | Check the spur near the cylinder that feeds the immersion relay is switched on | The spur is on and the code persists |
| 60, 65 | Room thermostat 1 or 2 fault | Replace the Halo Air batteries. It should re-pair on its own | It will not reconnect |
| 370 F0, F1, F22, 490 to 499, 516 | No connection to the outdoor unit | Check the isolator by the outdoor unit is on and no breaker has tripped | A breaker trips again |
| 385, 370 F21 | Low mains voltage or outdoor supply fault | After a power cut, do the reset described below once | It returns with power restored |
What are the most common Ideal heat pump error codes?
The Ideal codes we see most often are 370 F27 for no water flow, the airflow and fan faults, and the room thermostat codes 60 and 65. Ideal's fault list names each code, but its user guide only explains a handful. Causes marked "general" come from engineering experience, not the manual.
370 F27: no water flow (also F23 to F26)
Ideal's user guide says to check the system pressure is 1 to 1.5 bar and top up if it is below 1 bar. If the code stays, it points to a blocked system filter or air in the primary pipework. General causes also include sludge in the magnetic filter or strainer, a closed valve or a failing pump.
F23 to F26 are related: a heat exchanger temperature fault, a pump error, a thermistor and a flow sensor error. If pressure keeps dropping, read our guide to a heat pump losing pressure, then book an engineer to clean the filter and bleed the system.
370 F15 and F17: airflow and fan faults
F15 is an airflow fault and F17 a fan fault. Ideal's guide advises clearing leaves and snow from the unit. Generally, ice building up on the coil or fan when defrost is struggling is the cause in winter, though a fan motor can also fail.
If the unit is coated in ice, see our guide to a frozen outside unit. Do not chip at it.
370 F20 and F14: low pressure and pressure sensor
F20 is outdoor low pressure and F14 an outdoor pressure sensor fault. General causes are refrigerant loss, an iced coil or a failed sensor. Both need an F-Gas engineer.
370 F16, F18 and F19: compressor and discharge temperature
These are a compressor fault, a discharge temperature fault and a compressor temperature fault. In general, refrigerant loss, a blocked coil, poor airflow or a worn compressor sit behind them. Clear the unit if it is blocked, then call an engineer.
370 F2 to F12: outdoor thermistor faults
These codes name a specific outdoor sensor, including the heat exchanger, discharge, compressor, defrost (F9) and heatsink thermistors. General causes are a failed sensor, a loose plug or a damaged cable. A faulty defrost sensor can also cause poor or mistimed defrosting.
370 F0, F1, F22 and 490 to 499, 516: no outdoor connection
All of these mean the system has lost contact with the outdoor unit. Generally that is an isolator switched off, a tripped supply or a loose or damaged communication cable. Check the isolator and breakers, then call an engineer if it stays.
127: anti-Legionella fault
Ideal's guide says the weekly high-temperature cycle for the cylinder did not complete. Check the spur near the cylinder that feeds the immersion relay is on, and call an engineer if the fault persists. In general, a failed immersion element or cylinder sensor is the next suspect.
60 and 65: room thermostat faults
These relate to room thermostat 1 and 2. Ideal's guide says to check the Halo Air batteries, after which it should re-pair automatically. Generally, a lost wireless link from distance or interference is the other cause.
10, 26, 33, 44, 50 and 366: sensor faults
These are the outside, header, indoor flow, return, hot water and room sensors. The general cause is a wiring or connector fault or a failed sensor, and an engineer will test it before replacing it.
Which error code might you see in common situations?
What is going on around the house is often the quickest route to the right code. These are codes from Ideal's Logic Air list.
| Situation | Codes you may see on an Ideal | First check |
|---|---|---|
| Cold snap and iced outdoor unit | 370 F15, F17, F20, F9 | Steam and frost during a defrost lasting a few minutes is normal. If ice stays, clear snow and leaves around the unit |
| Losing pressure or low pressure | 370 F27 | Check the gauge reads 1 to 1.5 bar and top up if below 1 bar |
| Radiators lukewarm | 370 F27, F23, F24, F26 | Check pressure first. Cooler radiators in mild weather are normal on a heat pump |
| No hot water | 127, 50, 126 | Check the spur near the cylinder is on and the hot water settings |
| After a power cut | 385, 370 F21, 490 to 499, 516 | Do the isolator reset once the supply is stable |
| Unit noisy or fan not spinning | 370 F17, F15 | Look for ice or debris around the fan without reaching inside |
| After a service or filter clean | 370 F27, F26 | Check pressure is back to 1 to 1.5 bar and valves were reopened |
Radiators that stay cool with no code are covered in our guide to a heat pump not heating. For new rattles, see heat pump making noise.
How do you reset an Ideal heat pump?
Ideal's user guide gives one general reset: switch off the rotary isolator near the outdoor unit, wait 1 minute, then switch it back on. Give the system a few minutes to boot up before you judge whether the fault has cleared.
If the code comes back, the guide says to get help rather than keep resetting. Write down the full code from the Info screen, including any F sub-code, before you call.
Repeated resets without fixing the cause are a bad idea. The list even includes code 134, a recurring heat pump fault, which generally appears when an earlier fault has never been put right.
Ideal error code list
This list covers the Ideal Logic Air fault codes, including the 370 F sub-codes. Code names have been cross-checked against two sources, but always check the current installation guide for your model.
| Code | Meaning | Who should fix it |
|---|---|---|
| 10, 26, 33, 44, 50, 366 | Outside, header, flow, return, hot water or room sensor fault | Engineer |
| 60, 65 | Room thermostat 1 or 2 fault | Homeowner check |
| 81 to 84 | Bus short circuit, communication fault or address clash | Engineer |
| 100, 102 | Two clock masters, or clock without backup | Engineer |
| 126 | Hot water setpoint outside limits | Engineer |
| 127 | Anti-Legionella temperature fault | Homeowner check, then engineer |
| 134 | Recurring heat pump fault | Engineer |
| 146 | Configuration error | Engineer |
| 171, 369 | Alarm contact active or external fault | Engineer |
| 370 | Outdoor unit fault (read the F sub-code) | Depends on the sub-code |
| 385 | Low mains voltage | Homeowner check, then engineer |
| 489 | No cascade master | Engineer |
| 490 to 499, 516 | No outdoor connection | Homeowner check, then engineer |
| 506 | Back-up boiler not raising temperature | Engineer |
| 370 F0, F1, F22 | No outdoor connection | Homeowner check, then engineer |
| 370 F2, F5 to F12, F25 | Outdoor thermistor faults | Engineer |
| 370 F3, F4, F13 | Inverter, electrical filtering or outdoor electrical fault | Engineer |
| 370 F14 | Outdoor pressure sensor fault | F-Gas engineer |
| 370 F15 | Airflow fault | Homeowner check, then engineer |
| 370 F16 | Compressor fault | Engineer |
| 370 F17 | Fan fault | Homeowner check, then engineer |
| 370 F18 | Outdoor discharge temperature fault | F-Gas engineer |
| 370 F19 | Compressor temperature fault | Homeowner check, then engineer |
| 370 F20 | Outdoor low pressure | F-Gas engineer |
| 370 F21 | Outdoor power supply fault | Homeowner check, then engineer |
| 370 F23, F24, F26 | Heat exchanger temperature, pump or flow sensor fault | Engineer |
| 370 F27 | No water flow | Homeowner check |
Where can you find the official Ideal manual?
Ideal publishes the Logic Air installation and maintenance manual as a PDF on its own website, with fault codes covered in section 9. Homeowner user guides for Ideal products are in its user guides library.
- Ideal Logic Air Monobloc Heat Pump System installation and maintenance manual (PDF)
- Ideal Heating user guides library
Need help with an Ideal heat pump fault?
We repair Ideal Logic Air heat pumps across the UK. Our engineers are F-Gas certified and we are MCS accredited, so we cover refrigerant faults as well as flow, sensor, wiring and control problems.
We start with proper fault diagnosis, reading the full code from the Info screen and testing the part behind it. Then we carry out the heat pump repair it needs, with a 12-month guarantee on our work. If you are left without heating or hot water, our emergency heat pump repair team offers same-day visits where possible.
Many of these faults, especially 370 F27 and the airflow codes, are less likely on a system that is looked after. Annual heat pump servicing covers filters, pressure and the outdoor coil, as our annual service checklist shows, and our cover plans spread the cost.
Call 0333 041 5130 or contact us online to book.
Frequently asked questions
Are Ideal heat pump codes the same as Ideal boiler codes?
No. Ideal's Logic and Logic Plus boilers use a separate fault code system, so a boiler code chart will mislead you. Make sure any list you follow is for the Logic Air heat pump.
Does an Ideal error code void my warranty?
No, a code on its own does not affect your warranty. What can affect it is unqualified work inside the unit, or missed servicing if your terms require it. Check your warranty paperwork before anyone opens a panel.
Is steam or water coming from the outdoor unit a fault?
Usually not. Ideal's guide says frost, steam or extra water is normal during an automatic defrost, which lasts a few minutes, and defrosts happen more often around 2.5°C than below 0°C. Our guide to the heat pump defrost cycle explains why, and heat pump leaking water covers when it is a real problem.
Does 370 F16 mean the compressor has failed?
Not necessarily. A compressor fault code can be triggered by a supply problem or overheating as well as a worn compressor. An engineer will test before condemning it, and our guide to heat pump compressor problems explains the warning signs.
How long does an Ideal heat pump repair take?
Flow, sensor and wiring faults are often fixed in one visit. If a part such as a pump, fan motor or board needs ordering, expect a second visit. Refrigerant leaks take longer, because the leak must be found and tested before the system is recharged.
