Leigh · WN7

No Hot Water, Heating Works in Leigh: Parts & Repair Costs

When your central heating is working perfectly, radiators are warm, but your taps are delivering only cold water, it's a frustrating situation. Many customers in Leigh assume it's a major boiler fault. However, in this specific scenario, the boiler itself is usually fine. The issue almost always lies with the component that directs the heat either to your radiators or to your hot water – the diverter valve. This page outlines the parts typically involved, how long a repair might take, and what factors can influence the overall cost.

Call 07752 200878 Get a written quote

A close-up view of a boiler's internal diverter valve and associated pipework, highlighting a common point of failure when hot water is absent but heating works.

Leigh FAQs — no hot water but heating works — parts, labour and what drives the cost

Is it always the diverter valve if heating works but no hot water?+

In the vast majority of cases for a combination boiler, yes. The diverter valve is responsible for directing heat to either the central heating or the hot water. If the heating works, it means the boiler's burner and pump are generally functional, pointing to an issue with this specific component or related sensors.

How can I tell if my diverter valve is stuck or the motor is faulty?+

Without opening the boiler casing, it's difficult to be certain. A trained Brogas engineer will first check the boiler's fault codes, then manually test the actuator's movement and listen for sounds. A motor fault often prevents the valve from moving at all, while a stuck valve might show the motor attempting to move it without success.

Could a blocked plate heat exchanger cause this symptom?+

Yes, absolutely. The plate heat exchanger transfers heat from the boiler's primary circuit to your domestic hot water. If it's scaled or sludged internally, the heat transfer won't occur effectively, leading to cold or lukewarm water at your taps even if the boiler is firing correctly for hot water demand.

What is an NTC sensor and how does it relate to this fault?+

An NTC (Negative Temperature Coefficient) sensor measures water temperature. If the hot water NTC sensor is misreading the temperature, it might tell the boiler that the water is already hot enough when it isn't, causing the boiler to stop firing for hot water or not fire at all, even when there's a demand.

Local facts — Leigh

Postcode: WN7
Council: Wigan Council
Nearest road: A579 / A580 East Lancs
From Wigan: 6 miles south-east

Leigh is the largest town in the borough after Wigan itself, with Leigh Sports Village and Pennington Flash as the local landmark.

Read up first

Typical no hot water but heating works — parts, labour and what drives the cost work in Leigh

For Leigh householders and landlords dealing with parts, labour and what drives the cost. Local housing stock — red-brick terraces around Leigh town centre and newer estates toward Pennington — shapes how this work is carried out.

Understanding why radiators are hot but taps are cold.
Identifying the most likely boiler components involved.
Estimating labour time for specific part replacements.
Factors influencing the overall cost of the repair.
Steps for preventing future similar breakdowns.

Diagnosing the 'No Hot Water, Heating Works' Fault

For us, diagnosing this fault is methodical. We first confirm that the boiler is receiving a demand signal for hot water. If it is, the next step is to check the diverter valve actuator for movement. If the actuator moves but hot water isn't produced, we'll then investigate the flow through the plate heat exchanger, looking for blockages or scaling. Finally, we'd examine the hot water NTC sensor for accurate temperature readings. This systematic approach ensures we pinpoint the exact problem efficiently, rather than replacing parts speculatively.

Confirm hot water demand signal
Check diverter valve actuator movement
Inspect plate heat exchanger for flow/blockages
Verify hot water NTC sensor accuracy

Parts, Labour & Cost Factors for This Repair

The most common culprit is a diverter valve cartridge, which can wear or get stuck. Replacing this usually involves draining part of the system and can take 1.5-3 hours depending on boiler access and age. If the diverter actuator motor has failed, that's often a quicker swap, typically 1-2 hours. A domestic hot-water flow sensor or NTC sensor replacement is usually straightforward, around 1 hour of labour. The most involved repair is a scaled or sludged plate heat exchanger, which can require chemical cleaning or replacement, pushing labour closer to 2-4 hours, especially on older systems common in Leigh's red-brick terraces where maintenance might have been less frequent.

Diverter valve cartridge (1.5-3 hours labour)
Diverter actuator motor (1-2 hours labour)
Flow sensor/NTC sensor (approx. 1 hour labour)
Plate heat exchanger (2-4 hours labour for clean/replace)

Minimising Future 'No Hot Water' Issues

While some component failures are simply due to age or wear, maintaining your heating system correctly can reduce the risk. Regular servicing by a Gas Safe registered engineer helps identify potential issues early, such as sludge build-up before it impacts the plate heat exchanger or issues with diverter valve operation. Ensuring your system water quality is maintained with suitable inhibitors can also prolong the life of these internal components. We can advise on best practices specific to your boiler and system type during a service visit.

Annual boiler servicing by a Gas Safe engineer
Maintain system water quality with inhibitors
Address minor issues before they become major faults
Consider system flush if sludge is recurrent

Nearby areas we also cover

Hindley3 miles east of Wigan
Orrell3 miles west of Wigan
Ashton-in-Makerfield4 miles south of Wigan

Why locals choose Brogas here

As a Gas Safe registered business, Brogas diagnoses your boiler issue systematically. We trace the fault from demand signal to component failure. You'll receive a clear explanation of the repair needed, including parts and estimated labour.

In summary

If you have no hot water but working heating, the fault is typically with the diverter valve or related components. Brogas focuses on specific diagnosis to determine parts, labour, and repair cost factors, especially for Leigh's diverse housing stock.

Need a Gas Safe Engineer for 'No Hot Water' in Leigh?

If your heating works but taps are cold, contact Brogas today for expert diagnosis and efficient repair. Call us now.

Call 07752 200878 Message us