Hot Water But No Heating?
Common Causes and Expert Solutions

Are you experiencing a frustrating problem where your boiler provides hot water but no heating? This common issue can often be linked to faulty thermostats, diverter valves, heating valves, or other component failures?

At Smart Home Heat Limited, we specialise in diagnosing and fixing heating problems quickly, getting your system back up and running with minimal disruption. We are well-equipped with high-quality replacements for leading brands like Honeywell, Drayton, Salus, Hive, and Nest.

Here’s a guide to help you understand the most common causes and why Smart Home Heat Limited is your go-to choice for expert repairs.

Common Causes of Hot Water But No Heating

1. Faulty Thermostat or Thermostat Settings

A faulty thermostat or incorrect thermostat settings can be a primary reason why your heating isn’t working, even though you have hot water. Smart thermostats like Hive and Nest are designed to manage your heating efficiently, but if they fail, they can leave your home cold.

Common Issues with Thermostats:

Our Solution:

At Smart Home Heat Limited, we can quickly identify whether your thermostat is at fault and provide a replacement if necessary. Our engineers are experienced with all major brands, including Honeywell, Salus, Hive, and Nest. We’ll ensure your new thermostat is properly configured, getting your heating back on track.

2. Faulty Diverter Valve

A diverter valve is a critical component in combi boilers, responsible for directing hot water to either your radiators or your taps. When the diverter valve fails, your boiler might only provide hot water and no heating, which is a common issue in many systems.

Common Symptoms of a Faulty Diverter Valve:

Our Solution:

Smart Home Heat Limited engineers are experts in diagnosing and replacing faulty diverter valves. We carry high-quality replacement parts to get your heating system working efficiently again. Whether it’s a mechanical fault or an electrical issue with the diverter valve actuator, we’ll fix it quickly and professionally.

3. Faulty Motorised Valves (Zone Valves)

Motorised valves, including zone valves, control the flow of hot water to different parts of your home. A faulty valve can prevent hot water from reaching your radiators, leaving your home cold.

Common Symptoms of Faulty Valves:

Our Solution:

We are fully equipped with replacement valves from trusted brands like Honeywell and Drayton, ensuring that any faulty valves are replaced quickly and efficiently. Our engineers will diagnose valve issues and fit high-quality replacements to restore full heating function.

4. Radiators Not Working or Uneven Heating

If some of your radiators are not heating up properly, or if there’s uneven heating throughout your home, the problem might be air trapped in the radiators, a faulty TRV (thermostatic radiator valve), or sludge build-up.

Common Radiator Issues:

Our Solution:

We can bleed radiators, flush your heating system, and replace faulty TRVs from brands like Drayton and Salus. Our engineers will ensure your radiators heat evenly, providing consistent warmth throughout your home.

Struggling with cold or uneven radiators? Let Smart Home Heat Limited restore your heating efficiency with expert radiator servicing. Contact us to book your repair today.

How We Can Help? Professional Repairs and Replacements

At Smart Home Heat Limited, we pride ourselves on being fully equipped to tackle any heating problem, whether it’s due to a faulty thermostat, diverter valve, or radiator issues.

Our engineers are trained to work with all major brands, including Honeywell, Drayton, Salus, Hive, and Nest, and we carry a range of high-quality replacement parts to ensure quick fixes.

Why Choose Smart Home Heat ?

Struggling with cold or uneven radiators? Let Smart Home Heat Limited restore your heating efficiency with expert radiator servicing. Contact us to book your repair today.

Our Services

Frequently Asked Questions

Why do I have hot water but no heating?

This issue is often caused by faulty thermostats, diverter valves, motorised valves, or issues with radiator circulation. A professional engineer can diagnose the exact cause and carry out the necessary repairs.

How can I check if my thermostat is the problem?

Check that your thermostat is set correctly, batteries are not low, and it’s communicating with your boiler. If it’s a smart thermostat, ensure it’s connected to your home network. If the issue persists, a professional inspection is recommended.

What brands of thermostats and valves do you service?

We work with all major brands, including Honeywell, Drayton, Salus, Hive, and Nest. Our engineers can diagnose issues and provide high-quality replacements if needed.

Can I fix a faulty diverter valve myself?

Replacing a diverter valve requires specialised knowledge and tools. It’s best left to a qualified engineer to ensure safe and correct installation.

How long does it take to fix heating issues?

Our engineers aim to diagnose and repair heating problems on the first visit, using high-quality replacement parts. Most repairs are completed within an hour, depending on the complexity of the fault.

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