Potterton Boiler Repairs

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Potterton Boiler Repairs London

Gas Safe registered engineers • 24/7 call handling • London wide

Call Now: 0203 868 6251

Tell us the fault code and model. We will advise the safest next step.

Common Potterton models we repair include Promax, Gold, Titanium, and Suprima, with frequent calls for codes E133, E119, E125, and E128.

We fix Potterton boiler fault codes, no heating, no hot water, lockout, leaking, and low pressure across London.

We also offer boiler servicing and boiler installation across London.

Quick Navigation

• Safety First
• Quick Checks Before You Call
• Fault Code Table
• Most Searched Problems
• Why Potterton Boilers Fail
• Models We Repair
• Repair or Replace

Safety First

Smell gas? Turn off the gas supply at the meter if it is safe to do so. Open windows. Leave the property. Call the National Gas Emergency Service on 0800 111 999. Do not use switches, and do not use naked flames.

CO alarm sounding? Open windows immediately. Leave the property. Call 999. Do not re-enter until cleared by emergency services.

Boiler leaking heavily? Turn off the boiler at the controls. If safe, turn off the water supply. Call an engineer.

Quick Checks Before You Call

Before calling an engineer, these safe checks may resolve simple issues with your Potterton boiler.

Check the gas supply
Is gas working at other appliances in your home? If not, check your meter and any prepayment credit.

Check the pressure gauge
Pressure should read around 1.0 to 1.5 bar when cold. If below 1 bar, you may need to repressurise using the filling loop.

Check the thermostat
Is the room thermostat set above current room temperature? Are the batteries working?

Check the timer or programmer
Is the heating scheduled to be on? Check the clock is set correctly.

Try a single reset
Locate the reset button on your Potterton boiler. Press once and wait. If the fault returns, do not keep resetting. Call an engineer.

Check the condensate pipe
In cold weather, the external condensate pipe can freeze. Look for a white plastic pipe exiting through an outside wall. If frozen, pour warm water over it gently.

Potterton Fault Codes

Note: Potterton is part of the Baxi Group, so many fault codes are shared across platforms. Older Potterton models may use different codes or indicator lights. If unsure, call us and we will help you identify your specific code.

Common Potterton fault codes and what to do

Most Searched Potterton Problems

If you are seeing a lockout, loss of hot water, or your Potterton boiler keeps resetting, tell us the fault code and model and we will confirm the safest next step.

E133 – ignition failure

E133 is the most common Potterton fault code. The boiler tries to ignite but no flame is established. Common causes include gas supply issues, a faulty ignition electrode, or a blocked condensate pipe in winter. Check gas is on elsewhere in the home. Try one reset. If the lockout returns, stop and call an engineer.

E119 – low pressure

If your Potterton shows E119, system pressure has dropped below the minimum threshold. Top up via the filling loop to around 1.0 to 1.5 bar when cold. If pressure drops again within days, there may be a leak in the system or a failing expansion vessel. Call an engineer to find the cause.

E125 – circulation fault

E125 indicates the boiler has detected poor or no flow through the system. Check your radiators are getting hot. If circulation seems poor, there may be a pump issue, airlock, or sludge buildup. Call an engineer to diagnose and repair.

No hot water but heating works

On Potterton combi boilers, you may get heating but no hot water, or the reverse. This often points to a diverter valve issue. The diverter valve directs hot water between taps and radiators. When it wears or sticks, hot water delivery becomes unreliable. Call an engineer for diagnosis.

Why Potterton Boilers Develop Faults

Potterton is part of the Baxi Group, sharing many components with Baxi and Main. Here is what we commonly see.

Ignition electrode wear

Ignition faults (E133, E128) can occur when the ignition electrode wears or becomes coated with carbon. Condensate blockages in winter can also contribute to repeated lockouts.

Low pressure and expansion vessel faults (E119)

Low pressure faults often point to a failing expansion vessel or a weeping pressure relief valve. The expansion vessel absorbs pressure changes as water heats and cools. If the diaphragm fails or the air charge is lost, pressure drops can occur.

Circulation and pump issues (E125)

E125 can indicate poor circulation through the system. This may be caused by a failing pump, sludge buildup, or closed radiator valves. A powerflush may help restore flow.

Overheat protection (E131, E110)

Overheat faults indicate the boiler has shut down for safety due to high temperature. This can be caused by poor circulation, a blocked heat exchanger, or a faulty thermostat.

Diverter valve on combi boilers

The diverter valve directs hot water between your taps and radiators. When it wears or sticks, you may get heating but no hot water, or the reverse.

Potterton Models We Repair

We repair Potterton combi, system, and regular boilers in London, including:

Promax range: Promax Combi 24HE, Promax Combi 28HE, Promax Combi 33HE, Promax SL Heat
Gold range: Gold 24, Gold 28, Gold System
Titanium range: Titanium 24, Titanium 28, Titanium 33, Titanium 40
Suprima range: Suprima 30, Suprima 40, Suprima 50, Suprima 60
Other models: Performa, Profile, Housewarmer, and older Potterton units

Potterton parts are available through the Baxi Group network. We check availability before attending and advise honestly if repair is not viable or cost effective.

Repair or Replace Your Potterton Boiler?

We help you decide based on age, reliability, and parts availability.

Repair makes sense when

• Boiler is under 10 years old
• This is the first major fault
• Parts are readily available
• Boiler has been regularly serviced

Replacement may be better when

• Boiler is 12 to 15 years old or more
• You have had multiple breakdowns recently
• Parts are obsolete or hard to source
• The boiler is undersized for the property
• Energy bills are higher than expected for the property size

Our engineers give honest assessments. We focus on safety and reliability, not pushing unnecessary replacements.

Potterton Boiler Servicing

Annual servicing reduces breakdown risk and keeps your Potterton boiler running efficiently. See Boiler servicing London.

Landlords and Letting Agents

We provide boiler repairs and gas safety certification for landlords across London. See Landlord gas safety certificate (CP12).

Potterton Repairs Across London

London wide coverage for Potterton boiler repairs. Book an engineer or view our London areas we cover.

Have your postcode and fault code ready and we will confirm the quickest appointment slot.

Other Boiler Brands We Repair

Worcester • Vaillant • Ideal • Baxi • Glow-worm • Viessmann • Main • Vokera • Alpha • Ferroli

View all brands

Potterton Boiler Repair FAQs

How quickly can you attend for a Potterton breakdown?

We offer same day attendance where slots are available. For no heating or hot water, we prioritise urgent breakdowns. Call our 24/7 line and we will advise availability.

Do you carry Potterton parts?

We stock common Potterton parts including diverter valves, ignition electrodes, pressure sensors, fans, and PCBs. Parts are shared with the Baxi Group range.

Is it safe to reset my Potterton boiler?

Try one reset. If the fault returns after resetting, stop and call an engineer. Do not repeatedly reset, especially for E131 or E110 overheat faults.

How much does a Potterton boiler repair cost?

Costs vary depending on the fault and parts required. We diagnose first and quote before any repair work begins.

Related Services

• Emergency boiler repairs
• Boiler servicing London
• Boiler installation London
• Power flush London
• Landlord gas safety certificate (CP12)
• London areas we cover

Speak to Our Team

For safe next steps, call now.

Call 0203 868 6251 | Book an Engineer

Gas Safe registered • 24/7 call handling • Quote before work