Circulation fault (dry fire)
The E270 error code on Assure boilers indicates circulation fault (dry fire).
Assure E270 means: circulation fault (dry fire). On this component the documented failure modes are no water circulation: pump blocked, seized or not running. You can safely reset the boiler once — if E270 returns, do not keep resetting. A qualified heating engineer should diagnose the root cause.
What Does E270 Mean
The E270 code is shown by the boiler’s control board when it detects circulation fault (dry fire). The boiler then stops instead of continuing to run in that condition: the code is the appliance reporting a problem, not proof that the boiler is broken.
| What you see on the boiler |
|---|
| The display shows E270 and the boiler stops until the fault is cleared |
Common Causes
The manufacturer does not publish a cause list for this specific code. The causes below are the failure modes documented for the same component on other boilers, confirmed by the service literature of 5 different manufacturers.
| Cause |
|---|
| No water circulation: pump blocked, seized or not running |
Safety Warning
E270 involves electrical or pressure-related components. Do not attempt repairs without proper qualifications. Ensure the boiler is electrically isolated before any inspection. If you notice water leaks, unusual sounds, or pressure anomalies, contact a qualified heating engineer immediately.
Parts & Prices
Prices shown are indicative. Actual prices and availability vary by region.
Step-by-Step Diagnosis
Consult service manual
Refer to the Assure service documentation for the specific diagnosis procedure for fault code E270.
Check error log
Access the boiler error log to check for related fault codes that may help identify the root cause.
Contact manufacturer support
If the fault persists after basic checks, contact Assure technical support for specialist guidance.
How to Fix It
Check the pump is receiving power and turning freely; free a seized shaft or replace the pump if it does not run.
Refer to the Assure service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
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Affected Models
Assure models that can display fault code E270:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Assure models | — | Possible |
Frequently Asked Questions
E270 is not classified as a high-severity fault, so the boiler can be reset once. If E270 comes back, stop resetting: the underlying cause is still there and needs a qualified heating engineer.