Remeha E.00.17 Fault Code: Causes, Fixes & Repair Costs
What does the Remeha E.00.17 fault code mean?
The E.00.17 fault code appears on Remeha boilers — most commonly the Quinta Ace commercial and semi-commercial range — and sits within the E.00.XX series, which monitors thermal sensors and water-circuit parameters. Based on the numbering pattern of verified nearby codes (E.00.04 covers the return temperature sensor; E.00.40 covers the water pressure sensor), E.00.17 most likely relates to a flow temperature sensor fault or a maximum flow temperature monitoring anomaly. In plain terms, the boiler's control board has detected a reading from a temperature sensor that is outside its expected range — either an implausibly high or low value, or no signal at all — and has locked out as a safety precaution. Because the full Quinta Ace service documentation is not freely indexed online, the precise trigger condition for E.00.17 is best confirmed by an authorised Remeha engineer with access to the official commissioning manual for your specific model and generation. If you see this code, note down your exact boiler model and serial number before taking any action.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Faulty or failed flow temperature sensor (thermistor) Common
The flow temperature sensor is a small thermistor clipped onto the flow pipework with a wiring tail back to the PCB. If the thermistor element degrades or fails completely, it will produce a resistance value outside the expected range, triggering an E.00.XX lockout. This is the most common root cause for codes in this series.
- Loose or damaged sensor wiring Common
The sensor wiring can work loose from its connector on the PCB, or suffer damage — chafing, rodent interference, or heat exposure — along its run. A partial break or high-resistance joint can cause intermittent or out-of-range readings without the sensor itself being defective.
- Poor connection at the PCB terminal Sometimes
Even when the wiring itself is intact, the push-fit connector at the control board can become loose or corroded over time. A marginal contact here mimics a sensor failure and may produce an E.00.17 fault that clears temporarily on reset before returning.
- Actual overtemperature condition in the flow circuit Sometimes
If there is a genuine overtemperature event in the heating circuit — caused, for example, by poor water circulation, a blocked heat exchanger, or a stuck pump — the sensor may be reporting an accurate but unsafe value, causing the boiler to lock out correctly as a safety response.
- PCB fault Rare
In a small number of cases the control board itself misinterprets a valid sensor signal, or the analogue input circuit for that sensor channel has failed. This is less common than a sensor or wiring issue and should only be considered once sensors and connections have been checked and found to be serviceable.
How to fix it
- Note down the full fault code, boiler model, and serial number DIY safe
Before you do anything else, write down 'E.00.17', your boiler's model name (e.g. Quinta Ace 65), and the serial number from the data plate. If you have to call Remeha technical support (Remeha House, Wokingham, Berkshire) or an engineer, this saves time and ensures they can pull the correct service documentation.
- Check that your gas supply is working DIY safe
Confirm other gas appliances in your property — a gas hob or fire — are functioning normally. If there is no gas supply to the property, contact your gas supplier rather than resetting the boiler.
- Attempt a single boiler reset DIY safe
Press and hold the reset button on the boiler's front panel for the time specified in your user guide (typically 3–5 seconds). Wait at least 60 seconds to see whether the boiler fires up normally. If it locks out again with E.00.17, do not reset more than two or three times in total — repeated resets on a genuine sensor or overtemperature fault will not fix the underlying problem and can mask important diagnostic information.
- Check system pressure DIY safe
Glance at the pressure gauge or digital pressure reading. For most Remeha systems, normal operating pressure is between 1.0 and 2.0 bar when cold. If pressure is below 0.5 bar, top it up via the filling loop following your user manual's instructions. Low pressure alone is unlikely to cause E.00.17 specifically, but it is worth ruling out before calling an engineer.
- Have a Gas Safe engineer inspect the flow temperature sensor and its wiring Gas Safe engineer
An engineer will locate the flow temperature sensor on the primary circuit, inspect its mounting clip and insulation, and test its resistance with a multimeter to check it falls within the manufacturer's specified range. They will also check the wiring loom back to the PCB connector for continuity and insulation integrity. This work involves accessing internal boiler components and must be carried out by a qualified Gas Safe registered engineer.
- Engineer to test and replace the sensor if required Gas Safe engineer
If the thermistor is out of specification, the engineer will replace it with the correct Remeha-approved part (such as temperature sensor part 720480501, available from UK Remeha spares stockists). After replacement, the fault code must be cleared from the boiler's memory and the unit recommissioned to confirm normal operation.
- Engineer to inspect the PCB if the fault persists after sensor replacement Gas Safe engineer
Should the E.00.17 code return following a confirmed sensor and wiring replacement, the control board itself may have a faulty sensor-input channel. PCB diagnosis and replacement is a specialist task and must remain with a Gas Safe engineer; fitting the wrong board or incorrect firmware version can cause further faults.
- Call a Gas Safe registered engineer if you have not already done so Gas Safe engineer
If the boiler has not responded to a reset and you are unable to identify an obvious cause such as low pressure, contact a Gas Safe registered engineer. When booking, give them the full code (E.00.17), your boiler model, and its approximate age. You can verify any engineer's Gas Safe registration at GasSafeRegister.co.uk before they visit.
Parts you may need
- Remeha flow temperature sensor / thermistor (e.g. part 720480501) · from £38
- Sensor wiring harness / loom · from £45
- Remeha Quinta Ace PCB / control board · from £290
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 £120–£350, depending on the underlying cause.
Frequently asked questions
Is E.00.17 dangerous — do I need to leave my home?
An E.00.17 lockout means the boiler has shut itself down safely as a precaution; it is not a gas-leak or carbon-monoxide alarm. You do not need to evacuate, but you should not attempt to bypass the lockout or reset the boiler repeatedly. If you smell gas at any point, leave the property, avoid using electrical switches, and call the National Gas Emergency Service on 0800 111 999.
Can I fix E.00.17 myself, or do I need an engineer?
A homeowner can safely attempt one or two resets and check system pressure via the filling loop. Beyond that, diagnosing and replacing a temperature sensor, testing wiring, or assessing the PCB all require access to internal boiler components — this work must be done by a Gas Safe registered engineer. Remeha also recommends that servicing and fault clearance on the Quinta Ace range be carried out by an authorised Remeha engineer with access to the correct service documentation.
How much will it cost to fix E.00.17?
If the cause is a faulty flow temperature sensor and the wiring is undamaged, most UK homeowners pay in the region of £120–£350 including parts and labour (sensor parts typically cost £30–£50; a Gas Safe engineer's call-out and diagnostic labour typically runs £80–£150). If the fault has led to PCB damage, a replacement board can add £200–£350 to the bill, though this is uncommon for a straightforward sensor fault. Booking a standard appointment rather than an emergency call-out will keep costs down.
Why does E.00.17 keep coming back after I reset it?
Repeated lockouts after a reset almost always mean the underlying fault — most likely a degraded sensor, a loose wiring connection, or a genuine overtemperature condition — has not been resolved. Resetting clears the lockout temporarily but does not fix the hardware. If the code returns more than twice, stop resetting and arrange for a Gas Safe engineer to investigate; persistent resets can obscure fault-history data that helps an engineer diagnose the problem more quickly.
Which Remeha boilers show E.00.XX fault codes?
The E.00.XX series is associated primarily with the Remeha Quinta Ace and Quinta Pro commercial and semi-commercial condensing boilers. The domestic Avanta range uses a different, simpler fault-code format (E0, E1, E2, etc.). If you own an Avanta and see a code beginning with 'E.00', double-check the display — it may be showing a different format. If you are unsure which range your boiler belongs to, the model name is printed on the data label inside the front panel.