Radiators warm at the top and freezing at the bottom, a boiler that ticks but never quite delivers, a drip the customer says has always been there. Where do you actually start? This episode covers fault diagnosis and rectification on central heating systems and components for Unit 311 of the Level 3 Diploma in Plumbing and Domestic Heating, Phase 3, Learning Outcome 3.

Chris Bailey covers the general inspection every older system needs before a component is touched, the three diagnostic tools — fault-finding flow charts, fault-finding grids and manufacturer instructions — and the seven-stage fault rectification process every job should follow. He then works through twenty common faults by symptom, cause and action, from pumping over and persistent venting through to motorised valve failure and pump failure, before applying it all to six worksheet-style exam scenarios.

You will learn to:

Carry out a general inspection on an older central heating system

Apply fault-finding flow charts and fault-finding grids to narrow down a fault

Use manufacturer instructions correctly before working on a boiler

Apply the seven-stage rectification process: diagnose, notify, isolate, decommission, rectify, re-commission, handover

Diagnose common central heating faults by symptom, cause and action

Explain the effects of magnetite on a central heating system

Grab your Unit 311 Worksheet 3 and work through the six fault-finding scenarios before the next session.

central heating fault diagnosis, seven-stage rectification process, unit 311 phase 3, level 3 diploma in plumbing and domestic heating, magnetite and system faults

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