Why Does My Heating Not Turn Off? | J & S Plumbing and Heating, Lincoln
Has your central heating stayed on even after you’ve turned down the thermostat?
You’re not alone!
Many homeowners around Lincoln call us at J & S Plumbing and Heating asking, “Why won’t my heating turn off?“
In this quick guide, we explain the most common causes — and when it’s time to call a trusted local heating engineer.
1. Faulty Thermostat
A broken thermostat is one of the most frequent reasons a heating system won’t stop running.
If your thermostat isn’t correctly detecting the room temperature, it might keep your boiler running even when your home is already warm.
Tip:
Lower the temperature setting manually. If the heating stays on, you may need a thermostat repair or replacement.
2. Stuck Motorised Valve
Inside your central heating system, motorised valves control whether hot water flows to your radiators or taps.
If a valve becomes stuck open, it can cause radiators to stay hot all the time.
Tip:
A gas safe registered heating engineer can test and replace the valve quickly if needed.
3. Problems with Heating Controls or Programmer
A faulty heating programmer or timer can cause your boiler to keep running when it should be off.
Worn-out control panels or old wiring are often the hidden cause behind a central heating system not shutting off
Tip:
Try resetting your heating controls. Still not working? It may be time for an upgrade.
4. Boiler Faults
Modern boilers are smart — but even they can have problems!
Faulty sensors, PCB boards, or internal wiring issues can result in the boiler staying on even if no heating or hot water is requested.
Tip:
Look for fault codes or warning lights on your boiler display. If you spot one, call a Gas safe registered heating engineer.
5. Frost Protection Mode
Many boilers have a frost protection setting to prevent frozen pipes during colder months.
However, a faulty frost thermostat can mistakenly trigger heating even when the weather is mild.
Tip:
If your boiler is heating when it’s clearly not freezing, the frost setting may need adjusting or repairing.
Common Signs your heating needs proffesional help
If you’re noticing any of these issues, it’s time to get expert advice:
Radiators overheating even with heating off
Boiler continuously running
Heating system not responding to controls
Low pressure alongside heating faults
Strange noises coming from the boiler
For fast, affordable central heating repairs in Lincoln, trust J & S Plumbing and Heating.
Why Choose J & S Plumbing and heating?
✅ Fast, fixed-time appointments
✅ Friendly, expert engineers
✅ Transparent pricing and finance options
✅ Excellent customer reviews across Lincoln and nearby villages
Whether you need help with a heating system fault, boiler repair, or emergency heating support, we’re here to get your home warm — or cool — again!
📞 Call us now or book online. Your home comfort is just a call away!
Quick FAQ’s
Q: Can a faulty thermostat cause my boiler to stay on?
A: Yes! A broken thermostat is one of the most common causes of this heating issue.
Q: Should I try turning off the boiler at the mains?
A: You can switch it off temporarily, but always call a heating professional for a full diagnosis.
