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Maintenance and Service

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Boilers

Boiler Overheat Lockout

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Boilers

Alfa Laval

Ariston

Baxi

Biasi

Boiler Overheat Lockout

Chaffoteaux

Electroheat PLC

Ethos

Ferroli

Glowworm

Halstead

Heat Lline

Ideal

Keston

Main

Myson

Potterton

Saunier Duval

Vaillant

Viessmann Vitodens 100 W Compact

Vokera

Worcester

Showers

Aqualisa

Bristan

Crosswater

Crosswater

Grohe

HUB-001A-WAX Vado Thermostatic Cartridge

Hansgrohe

Hudson Reed

IB

Mira

Porcelanosa

S960134NU Thermostatic Cartridge

Sirrus Rothwell R995 Antique Shower

Trevi

Triton

Triton

Ultra

Vola

Taps

Armitage Shanks

Grohe

Hansgrohe

Mayfair

Phoenix

Space Heaters

Baxi

Remeha

Bathstore Thermostatic Cartridge

Servicing Guide

Pumps

Grundfos

Thermal Store Cylinders

Pulsacoil

Underfloor Heating

PolyPlumb

Toilets

Geberit

Grohe

Hot Water Cylinders

Dimplex

Megaflow

Santon

Gas Safety Inspection

Gas Flue Analysers

Gas Hobs

AGA

Neff

Boiler Overheat Lockout Boiler goes to lockout after 2 hours after reset

Boiler has started to shut down with the overheat lamp lit. This happens after the boiler has been running for at least 8 hours. Once reset, it will run again for a number of hours before tripping out again. The problem is more likely the central heating system than the boiler. Basically the hot water is not getting out of the boiler fast enough so that when the flame goes off the residual heat in the boilers internal heat exchanger causes the water to become overheated and trip the safety device.

  • Has the pump speed been turned down? Turn it up to maximum.
  • Do you have radiators and /or towel rail that have manual valves on (not thermostatic) to accept a flow of water when other rooms with thermostatic valves on have warmed up? If so are they open?
  • Have you recently insulated some pipework that is meant to be uninsulated as part of a heat sink / by pass system.
  • Is there a lot of air in the system preventing proper circulation?
  • Is the system working properly otherwise? sludge in the system may prevent proper circulation.
  • Is the flue is not blocked?
  • Does the pump connected to overrun?
  • Is by-pass valve opened?
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