What Happens During a Boiler Service?

Quick Answer: A proper boiler service takes 45-60 minutes and includes visual inspection, internal checks, safety tests, flue analysis, and efficiency verification. The engineer should check 15-20 items and issue a service report.

Full Service Checklist

1. Visual Inspection (10 mins)

• Boiler casing condition
• Pipework connections
• Signs of leaks or corrosion
• Flue condition (internal section)
• Ventilation adequacy
• Condensate drain

2. Remove Casing & Internal Checks (15 mins)

• Burner condition
• Heat exchanger inspection
• Ignition system check
• Electrodes cleaning
• Main injector check
• Seals and gaskets

3. Safety Tests (15 mins)

• Gas tightness test (for leaks)
• Burner pressure check
• Operating pressure verification
• Safety device testing
• Flue gas analysis
• Carbon monoxide measurement

4. Performance Checks (10 mins)

• Boiler efficiency test
• Thermostat operation
• Hot water temperature
• Heating operation
• Timer/programmer function
• Condensate drainage

5. Documentation (5 mins)

• Complete service record
• Note any issues found
• Recommendations for work
• Update appliance records
• Issue Gas Safety Certificate (if landlord)

What Should Cost £80-£120

A service at this price should include ALL the above. If an engineer is in and out in 20 minutes, important checks are being missed.

Red Flags During Service

Warning Sign	What It Means
Yellow/orange flame	Incomplete combustion (dangerous)
Black marks	Soot, combustion issue
Smell of gas	Possible leak
High CO reading	Dangerous, needs repair
Corroded parts	May need replacement
Low pressure	Leak in system

After the Service

You Should Receive:

• Written service report
• Confirmation of checks done
• Any recommendations
• Gas Safety Record (if landlord)
• Stamp/record in boiler logbook

What Happens Next?

• All clear: Book again next year
• Minor issues: Schedule repairs
• Safety concerns: May be "at risk" or condemned

"At Risk" vs "Immediately Dangerous"

Status	Meaning	Action
Safe to use	Passed all checks	Continue using
At Risk	Some concern but usable	Repair soon
Immediately Dangerous	Unsafe to use	Will be disconnected

Engineers are legally required to disconnect dangerous appliances.

How Often Should You Service?

• Homeowners: Annually recommended
• Landlords: Annually required by law
• Warranty: Usually annual to maintain

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Book boiler service: +44 141 468 9930 - £80-£120