Ravenheat HE80 98S Fault codes & diagnostics

3 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 24 kW 2000-2005 Discontinued
Download the Ravenheat HE80 98S manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Just want the most common Ravenheat HE80 98S faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 3 documented codes

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08E

Your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.

High DIY-safe £80-150

What to check first

  1. Locate the external filling loop, which is usually a silver braided hose with one or two valves located underneath the boiler.
  2. Open the valve(s) slowly to allow mains water into the system while watching the pressure gauge on the front of the boiler.
  3. Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar, then ensure the valves are tightly closed.

Parts commonly replaced

  • Pressure relief valve
  • Pressure sensor
  • Expansion vessel
Full explanation for 08E
E01

Your boiler has stopped working because it cannot light the internal flame needed to heat your home's water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for E01
E08

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

High DIY-safe £80-150

What to check first

  1. Locate the external filling loop, which is a silver braided hose with one or two valves underneath the boiler.
  2. Slowly open the valve(s) to allow mains water into the system while watching the pressure gauge on the front of the boiler.
  3. Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar, and ensure the valves are fully closed.

Parts commonly replaced

  • Pressure relief valve
  • Expansion vessel
  • Pressure sensor
Full explanation for E08
Status & diagnostic codes

1 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

AF Status Your boiler has detected that the temperature inside the unit is very low and has briefly activated its internal heater to prevent the pipes from freezing.