page updated 11 April 2018      © Lovekin Ltd 2008-2018      Company Reg. 3950749      VAT No. 733 7196 21      73 Roberts Rd   Aldershot   GU12 4RB      01252 334440      Cookie Policy

Link to Lovekin Ltd boiler service home page

Lovekin are a local company who started in Ash in 1986 and have been servicing boilers in Ash and Ash Vale, Tongham and Mytchett for more than 25 years. We have a commitment to high quality work and long-term relationships with our customers, many of whom have been with us over 20 years.

Gas Boiler Servicing in Ash and Ash Vale, Tongham and Mytchett

Clean blue flame in an Ideal Concord CF boiler

Call us  01252 334440

Or you can email Ange

Service Prices – all including VAT

We charge £94 for the first appliance and £68 for each additional appliance but for new customers we’re offering an introductory discount of £10 taking the price for the first appliance down to £84!

If your neighbour wants a boiler service too we’ll give each of you a £10 discount if they’re done together and that’s in addition to the introductory discount for new customers.

We are Gas Safe Registered No. 66587

and Worcester Accredited Installers

Lovekin Gas Boiler Servicing in Ash and Ash Vale, Tongham and Mytchett

If your gas boiler has an extended warranty it’s important to have it serviced every year by a Gas Safe Registered engineer. Annual servicing is a condition of the manufacturers’ warranties.

We work with mains gas only (natural gas) not LPG.

Below are a series of pictures with notes about boilers we’ve serviced. They range from the very old to modern, state of the art appliances. There’s also a description of a service on a Worcester Bosch Greenstar Ri boiler to give you an idea of what we do.

Lovekin also install and repair gas boilers and central heating systems.

Combustion analysis on a Baxi Boston gas boiler

Combustion analysis on a Baxi Boston floor standing gas boiler. We are also checking the main burner pressure. This is an open-flued appliance, drawing its combustion air from the room. It tends to draw dust, fibre and animal hair towards it and these can block the filter.  It’s very important that the wire mesh air intake filter in the picture is kept clean. If there are pets in the house this filter may need to be regularly hoovered clean!

Combustion analysis print out

Combustion analysis results from a high efficiency boiler. The combustion ratio must not be above 0.0040 but these results show much cleaner combustion. With a ratio of 0.0008 it is five times cleaner than the maximum allowed.

The gross efficiency of 88.5% shows that only 11.5% of the heat is lost to the environment via the flue gases.

Vaillant EcoTec Plus 824 boiler

High efficiency Vaillant EcoTec Plus 824 combi boiler opened up for servicing. This boiler returned a gross efficiency of over 89%. With high efficiency boilers it’s important to make sure that the condensate trap is not blocked with debris as this can cause the boiler to lock out.

High Efficiency Greenstar Ri Boiler

The Greenstar Ri is a modern high efficiency, heat only boiler. The Greenstar 24i Junior and 28i Junior are combi boilers based on the Ri. These appliances are all room-sealed and fan-flued and have gross efficiency of over 88%. Less than 12% of the heat they produce is lost in the flue gases so their carbon footprint is lower than it is for conventional appliances.

Baxi Bermuda with fire front removed

This is a later Baxi Bermuda back boiler. This type of appliance has been around for about 40 years. They are open flued and draw their air for combustion from room air at low level. This draws in dust and fibre which can block the wire mesh air inlet filter. Regular servicing is very important to their safe operation and, as with all open flued appliances, we recommend that an electronic carbon monoxide alarm is fitted in the room.

Rusted Baxi Bermuda 551 burner

This burner was from another Baxi Bermuda, the 551, which was quite a lot older. The heat exchanger had been slowly leaking water onto the burner, probably for years and the boiler had to be replaced.

Kingfisher 2 stripped down

Parts of a Potterton Kingfisher 2CF open-flued, floor standing boiler. Open flued appliances draw combustion air from the room and have an air connection between the combustion chamber and the primary flue and room air. This makes them inherently less safe than room sealed appliances. They are also less efficient as warm room air is drawn in for combustion and flue dilution and passed out of the building via the flue. Open flued boilers are gradually disappearing as nearly all new boilers are now room sealed and fan flued, making them more efficient and safer.

Precision pilot heating the thermocouple tip

Precision pilot in an open-flued appliance. This type of pilot assembly has several names, each describing how it works. It is known as an atmospheric sensing device (ASD) or an oxygen depletion sensor (ODS) or a vitiation sensing device (VSD).

It is a safety device which shuts off the appliance if the air supply is insufficient for safe combustion. The sharply defined horizontal tongue of flame heats the tip of the thermocouple, generating a small electrical current which keeps the gas valve open. If the air in the room becomes vitiated and the oxygen available to the pilot flame is reduced, the flame becomes softer and less defined and lifts away from the thermocouple tip. When the thermocouple cools, the electrical current fails and the gas valve shuts down preventing dangerous combustion. This can also happen if the air inlet to the pilot assembly becomes blocked with dust or fluff as in the picture to the right.

Dust choked air intake filter on a precision pilot

Precision pilot assembly from a gas fire. The air inlet filter had become choked with dust and small strands of fibre, reducing the oxygen available to the pilot flame. The flame lifted away from the thermocouple tip and the thermocouple cooled, shutting the appliance down. This appliance was long overdue for a service!

Ancient Vulcan Autostat room sealed gas boiler

Lovekin service gas boilers in Ash GU12, Ash Vale GU11 and GU12, Tongham GU10 and Mytchett GU16. We also service boilers in Aldershot


Because we carry out fault-finding on gas appliances and central heating systems and controls, we collect a lot of information on heating and gas boiler problems. We have another web site dealing with these problems and solutions. It’s at www.lovekin.net


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Ancient Vulcan Autostat room sealed, floor standing boiler. This boiler was over 40 years old and consistently returned gross efficiency figures of over 80%. The large circulating pump (top left) has the name “Junior” written on it! It’s as old as the boiler which is a remarkably long life for a pump.

Servicing a Worcester Greenstar Ri

Worcester Bosch are the dominant manufacturer in the market place at the moment and we deal with a lot of their Greenstar Ri boilers. The Ri is a heat only appliance which originally came in a range of heat outputs from 12kW to 24kW and has now been joined by two more powerful boilers at 27kW and 30kW.

These last two are of a different internal design and the service described was on a Greenstar 15Ri.

After a quick visual check of the outside of the boiler we went out to take a look at the flue terminal. Correct combustion depends partly on adequate air supply and the air ducts can become partly blocked with spider webbing. The flue and air ducts are concentric tubes with the flue duct running down the centre of the air duct. We brushed through the air duct (photo on the right).

To check flue duct integrity we used a combustion analyser to check the levels of oxygen, carbon dioxide and carbon monoxide in the air duct. This is done with the sample probe in the air sample point (the upper sample point). The boiler is run with the outer casing left on.

If a flue duct seal is damaged or displaced there is a risk of flue gases passing out of the (central) flue duct into the (outer) air duct and this can make combustion dangerous. Oxygen in the air duct should be very close to 20.9% and there should be no carbon dioxide or carbon monoxide present. The results were fine and we refitted the air sample plug.


The upper sample point on the Ri boiler turret is the air duct test point.

We checked the pipes connecting to the boiler for water leakage and found none. We then removed the outer case of the boiler and and checked for any water leaks or damage internally.

Greenstar Ri boilers are usually very clean but if there was visible debris inside or out we’d hoover it up.

The condensate trap on any high efficiency boiler can need cleaning out. Thankfully Worcester were bright enough to use a clear plastic trap so it’s possible to see whether or not there is debris there without removing it. The photo right, above, shows debris at the bottom left.

The photo right, below, shows the cleaned trap, refitted. Removing and refitting the trap may require a seal to be changed, which would add slightly to the cost; if the amount of debris is only very small it would be left until the next service.

This trap is also better than a simple U bend; it has an auto-syphon function so the condensate is released one cupful at a time, rather than as a slow continuous dribble which might freeze in winter if the condensate pipe runs outside the building.

Sediment in the bottom of a clear plastic condensate trap. This condensate trap has been washed free of debris and re-fitted.

It’s important to check visually and listen for failure of the main combustion gasket. Rarely, this can fail and would need to be replaced. The following four photos show a badly damaged gasket, damaged electrodes and damage to the ignition and sensing leads caused by the escaping hot gases. These four photos were, however, from a different Ri boiler.

Badly scorched combustion gasket. Corroded ignition and sensing electrodes. Overheated insulation on the sensing electrode lead. Overheated insulation on the ignition leads.

Worcester Bosch specify that the Greenstar Ri boiler should only be stripped down further if the fan pressure is outside the parameters they set, with the boiler running on maximum.

We used the pressure gauge on our analyser, connected by a thin hose to the fan pressure test point just below the air/gas duct near the top of the boiler.

The boiler is set to maximum using a small white plastic tool which is located into a rotary switch at the bottom edge of the circuit board.

Fan pressure for the 15Ri must be less than -5.5 mbar.  To accommodate us ignorant heating engineers the manufacturers say it must be negative and greater than -5.5 mbar. This is mathematical nonsense.

Whatever the clumsy wording, it needs to be more negative than -5.5, so -5.6 would be fine, whereas -5.4 would not. If the correct negative fan pressure can’t be achieved, the boiler needs a deeper strip-down and clean. The pressure on this boiler was fine.

Fan pressure test point on a Greenstar Ri boiler. Adjusting the minimum/maximum rate switch on a Greenstar Ri.

The analyser sample probe is connected to the flue sample point on the fan turret. This is the lower of the two points.

With the boiler still running on maximum the carbon dioxide and carbon monoxide are checked, and their ratio. These must comply with the manufacturers specified ranges.

Open flue sample point on the Ri boiler flue turret. Using a combustion analyser probe on a Greenstar Ri.

 If the carbon dioxide level needs to be altered a 2½mm allen key (hex key) is used to adjust the gas valve (photo below left). When the setting is correct on maximum, the boiler is set to minimum and checked again. If carbon dioxide level is out on minimum, a 4mm allen key (hex key) is used to re-set it.

When the level is correct on minimum it is re-checked on maximum and may need to be re-adjusted. When both are OK the flue sample point is closed and the combustion results are printed out.

Adjusting carbon dioxide at maximum combustion rate. 4mm hex key adjusting carbon dioxide level at minimum combustion rate. Black plastic fllue outlet and air inlet terminal from a Worcester Greenstar Ri boiler Cleaning the air duct with a bottle brush from outside the house.

The boiler was re-set to run at normal power and the outer casing refitted before handing back control of the heating to the customer.

Different boilers have different servicing requirements but the combustion results, and particularly the combustion ratio, are critical.

Click or tap a picture for more about us

Jacky is a director of Lovekin Ltd Paul is a director of Lovekin and a registered gas engineer Ange is our office manager and the friendly voice on the phone Lois is a registered gas engineer working with Lovekin Black and white logo of the Gas Safe Register