It will be a fault with the fan speed, flue airways, air pressure hose(s), thermistor(s), air pressure switch or its connections, printed circuit board, gas valve, ignition components, or condensate pump. Your boiler service company will be able to check both components using a multi-meter. A logical approach is required to quickly track down, isolate, and repair the fault. But, itâs important not to start replacing parts until every possibility has been ruled out. A combi boiler should be serviced regularly, ideally every year, by a competent person and this person must be CORGI registered, as this is the law. If it is, theyâll attempt to free the valve. It is either failing in its heating role or failing in its hot water role or both. Common fault 4: Strange banging noises. Theyâll then fit a boiler filter, to stop sludge build-up happening in the future. Theyâll fault find by testing the connection to the PCB from the gas valve, as well as checking the PCB and gas valve for faults. Expect to pay somewhere in the region of Â£250, and that includes both parts and labour. If the pump is faulty, replacements can be found from leading brands such as Grundfos. Basically, water is not able to circulate around the heating system correctly. Follow safe working procedures and always carry out electrical safety checks. The gas valve should be closed, but the PCB is still detecting a flame. Theyâll be able to tell exactly which one is at fault, by testing all NTC thermistors on the boiler using a multi-meter. Just below, we have a list of common codes related to the Poterton Boiler. If a fault code or message has appeared on your Ideal boiler, the following information may be useful. This can cause you to control their boiler, and vice-versa. Ensure system has appropriate electrical polarity. The air pressure switch notices this and locks the boiler out as a safety precaution. use knowledge of the components and operating principles to remove the cause of the fault. Sometimes, the damage is minor. Thatâs useful information for your boiler service engineer. However, this is a fault thatâs directly related to the gas valve. The most probable cause here, is the gas valve. If it is the thermostat thatâs tripping, then itâs going to need to be replaced. However, on some occasions, the cause of the E321 fault code being displayed is the PCB. Thatâs going to cause a gas supply issue that could be dangerous. On some occasions, this is a simple case of a fan speed that is too low. If there is no display on your control panel, this is a sign that there may be a power outage. Having verified where the fault is and which component or components is causing the disturbance of the boiler sequence, it can be repaired. You need to get an understanding of what you are looking at, establish the main components, and the ignition type, including: electric, diaphragm pass, wax capsule, or venture. However, if the problem stems from the PCB, this is going to be an expensive fix. This code is displayed on Potterton boilers when the boiler has tried to ignite 12 times and failed. All boilers, BAXI boilers included, are prone to lockouts from time to time, but this fault has been particularly common with the Baxi Solo 1PF and 2PF over the years. This reduces the pressure in the boiler to a point where it canât operate. If the boiler was to continue operating, it could overheat and damage expensive components. That said, your boiler service engineer will want to first check the safety thermostat. For instance, there could be a problem with the PCB. There a switch on the boiler the E384 fault code working correctly, is a fault thatâs directly related the... And locks the boiler will lock out show the E128 fault code jets are incredibly delicate, so tiny! On wiring and connections to/from the valve might be shut, and itâs the PCB needs to be.! 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