D.36 Medium
Your boiler is having trouble measuring the flow of hot water, which could mean your taps don't get as hot as they should or your hot water fluctuates.
Technical description: Hot water flow sensor
Typical repair cost: £120-£220 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.36 — no call-out fees, no surprises.
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Parts commonly replaced
- Hot water flow sensor
- Vortex sensor
- Wiring harness
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