Nest Heat Link Replacement London Engineer Service

Quick Check Before You Book

• No light on Heat Link? The unit may have failed, especially if power is present but the Heat Link does not respond.
• H71 or connection error? The thermostat may have lost connection to the Heat Link, or the Heat Link may need replacing and pairing again.
• Heating not switching? We check the wiring, replace the Heat Link where needed, then test heating and hot water controls.

What’s Included in the Visit

• Safety checks: Power is isolated and the existing wiring is checked before the Heat Link is removed.
• Like-for-like replacement: The replacement Heat Link is wired to match the existing heating and hot water controls where suitable.
• Pairing and testing: The thermostat is paired back to the Heat Link and checked with the Nest app where needed.
• Heating test: We test that the boiler responds correctly when heating is called from the thermostat.
• Hot water test: If your Nest controls hot water, we test the hot water channel and cylinder controls where accessible.
• Engineer handover: We explain what was changed, what was tested, and anything else found during the visit.

Nest Heat Link Replacement Cost

Clear pricing for common Nest Heat Link faults in London.

Repair, Exchange or Replace?

Most customers want the heating working again as quickly as possible. We focus on getting the Nest system safely working again, not leaving you waiting without heating.

• Replacement: Best when the Heat Link has failed and the fastest route is to fit a working unit.
• Exchange: Where available, a working exchange unit may be used and the faulty unit retained for repair logistics.
• Not repairable: Burnt, melted or badly damaged units may need a full replacement rather than repair or exchange.

Common Heat Link Faults We See

• No LED light: The Heat Link appears dead and does not respond even though the heating system has power.
• H71 error: The Nest display cannot connect to the Heat Link and the heating may stop responding.
• Heating stuck off: The thermostat calls for heat, but the boiler or valve does not respond correctly.
• Hot water not switching: On hot water systems, the cylinder control may stop responding from the app or thermostat.
• Intermittent faults: Heating works sometimes, then drops connection or fails to switch at the expected time.
• Failed pairing: The display and Heat Link will not reconnect after a reset or power cut.

Frequently Asked Questions

How much does Nest Heat Link replacement cost?

Nest Heat Link replacement is from £149. Pairing-only visits and diagnostic call-outs are £99. Use the price buttons above to view the correct WooCommerce service before booking. Central London / CCZ appointments may include a £25 surcharge.

How long does a Heat Link replacement take?

Most Heat Link replacements take around 30 to 60 minutes, including wiring checks, pairing and testing.

Can you pair the thermostat back to the Heat Link?

Yes. We pair the thermostat back to the Heat Link where needed and check that the heating responds correctly.

Will I lose my Nest schedules?

Usually no. Your schedules are normally linked to the thermostat and app. The visit focuses on replacing or reconnecting the Heat Link.

Can you test hot water as well?

Yes, if your Nest system controls hot water. We test heating and hot water where the system wiring and controls allow access.

What if my Heat Link looks burnt?

Burnt terminals, melted plastic or arcing damage usually need full replacement rather than repair. Send a photo first if you are unsure.

Can I supply my own Heat Link?

Yes, if it is the correct UK part and suitable for your Nest system. We can also advise if you are not sure what to buy.

Do you cover my area?

We cover London and nearby areas. Send your postcode when you contact us and we will confirm availability.