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Fault finding by symptom

Boiler not firing

A boiler that will not fire can arrive with a fault code, a lockout indication or no useful display message at all. The first useful step is to identify the appliance and establish what part of the operating sequence is failing.

TradeAssistIQ lets you start with the symptom and then narrow the diagnosis around the manufacturer and appliance you are actually working on.

Search a fault in TradeAssistIQ

Treat the symptom as the starting point

Similar symptoms can have different causes across different appliances. Manufacturer-specific information, the operating sequence and actual measurements should guide the next test rather than a generic list of parts.

Use the technical evidence available

Where supported by approved technical knowledge, TradeAssistIQ can surface relevant diagnostic steps, expected readings, component tests, wiring information and manufacturer documentation for the identified appliance.

Useful next pages

Heating engineer technical assistantDiagnose this fault

TradeAssistIQ is an engineering support tool. Diagnosis, testing, repair and commissioning must be carried out by appropriately qualified persons and in accordance with the appliance manufacturer’s instructions and applicable regulations.