D.90 Low
Your boiler is currently waiting for the digital control system to finish communicating, which usually means it is temporarily busy rather than broken.
Technical description: Digital regulator status
Typical repair cost: £0-120 (including labour)
DIY fix possible
Check if any smart thermostats (like Hive, Nest, or vSMART) are currently updating their softwareTurn the boiler off at the main switch, wait 30 seconds, and turn it back onWait 10 minutes to see if the status clears automatically after communication is restored
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.90 — no call-out fees, no surprises.
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Parts commonly replaced
- eBUS controller
- External gateway module
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