An out-of-hours call on a Saturday. The overheat light was flashing when we arrived. We topped up the pressure, found and tightened a loose automatic air vent that started leaking, and tested the heating.
An out-of-hours emergency on a Saturday in the Jewellery Quarter. The customer has a Potterton Gold electric boiler, and when we arrived its overheat light was flashing. The system pressure was low, so we topped it up. As the pressure came up, a leak sprang from the automatic air vent, the small valve that lets trapped air out of the heating system. It was loose. We tightened it, checked it was dry, and tested the heating. It was all working again before we left.
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£99 in office hours (Mon–Fri, 8am–5.30pm) covers attendance, diagnosis and the first hour. Parts and any further work are quoted and agreed before we carry on. Out of hours, the price is quoted by phone before we set off.
No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked. Full price list
Smell gas now? Do not use this form or wait for a reply. Call the National Gas Emergency Service free on 0800 111 999 (24 hours). If you are using a mobile, make the call from outside. Open doors and windows, do not switch electrics on or off, do not smoke or use naked flames, and turn the gas off at the meter if it is safe to do so, unless the meter is in a cellar or basement. Once the supply has been made safe, we can trace and repair the fault.
The call came in on a Saturday, out of hours, from a customer in the Jewellery Quarter. Their heating comes from a Potterton Gold, a wall-hung electric boiler with no gas and no flue, and when we arrived its overheat light was flashing.
The system pressure was low. Low pressure means less water moving through the boiler to carry the heat away, which is a common reason for an overheat warning. We topped the pressure up, and as it came up a leak sprang from the automatic air vent, the small valve that lets trapped air out of the heating system. It had worked loose.
We tightened the air vent and checked it was dry. With the pressure back where it should be, we tested the heating through its operation, and everything was working again before we left. A loose vent like this one is also a likely route for the pressure to drop in the first place, which is why we look for a leak whenever a system needs topping up.
Our electric boiler and water heater page covers servicing, repairs and the faults we see most on electric boilers.
Out of hours, including weekends, we quote the price on the phone before we set off. In office hours an electric boiler repair is £99, covering diagnosis and the first hour, with parts quoted before we fit them. Details are on our 24/7 emergency page and our price list.
It means the boiler's overheat protection has been triggered. Low system pressure is a common cause, because there is not enough water moving through the boiler to carry the heat away. Do not keep resetting it. Check the pressure gauge if you have one, and call an engineer to find out why it happened.
It is a small valve, usually on top of the boiler or the pipework, that lets air out of the heating system so it does not collect and stop the water circulating. If one works loose or its seal fails, it can leak water instead of air, especially once the pressure is brought back up.
Yes, as well as gas boilers. In office hours a repair is £99 for diagnosis and the first hour, with parts quoted before we fit them. Out of hours, including weekends, we quote the price on the phone before we set off.
Yes. Our emergency line runs 24 hours a day, seven days a week, including Saturdays and Sundays. This job was a Saturday callout.
Job attended and photographed by our engineers, October 2026. Written up by Saeed Iqbal, the engineer who leads Synergy Gas & Plumbing (Gas Safe registered 594385). More of our work across the city is on our Birmingham page, and every job we write up is on the case studies index.
£99 diagnosis + first hour
£99 in office hours (Mon–Fri, 8am–5.30pm) covers attendance, diagnosis and the first hour. Parts and any further work are quoted and agreed before we carry on. Out of hours, the price is quoted by phone before we set off.
No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked.
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Read the case studyThe boiler was showing an H09 fault. We diagnosed a faulty circuit board and, with the board on the van, had the customer back up and running on the same visit.
Read the case studyA routine Complete service that found dark system water and no inhibitor. The customer was shown the water, agreed to the fix, and the system was dosed before we left. A five-star review followed the same day.
Read the case study£99 in office hours covers attendance, diagnosis and the first hour. Parts quoted before we fetch them.
