Purge rate proving failed
The 19 error code on Burnham boilers indicates purge rate proving failed.
Burnham 19 means: purge rate proving failed. The usual causes are loose connection in 120 vac blower wiring, loose or miswired blower speed harness or defective blower. You can safely reset the boiler once — if 19 returns, do not keep resetting. A qualified heating engineer should diagnose the root cause.
What Does 19 Mean
The 19 code is shown by the boiler’s control board when it detects purge rate proving failed. 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 19 and the boiler stops until the fault is cleared |
Common Causes
Causes documented in the Burnham service literature published by usboiler.net, cross-checked against the manufacturer’s fault-code table.
| Cause |
|---|
| Loose connection in 120 VAC blower wiring |
| Loose or miswired blower speed harness |
| Defective blower |
Safety Warning
19 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 Burnham service documentation for the specific diagnosis procedure for fault code 19.
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 Burnham technical support for specialist guidance.
How to Fix It
Unplug and re-seat the connector of the component, then check the harness for chafing, corroded pins and breaks in continuity.
Unplug and re-seat the connector of the loose or miswired blower speed harness, then check the harness for chafing, corroded pins and breaks in continuity.
Check the fan turns freely, then check its connector, wiring and speed signal; replace the fan if the bearings are worn or the signal is absent.
Refer to the Burnham service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
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Affected Models
Burnham models that can display fault code 19:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Burnham models | — | Possible |
Frequently Asked Questions
19 is not classified as a high-severity fault, so the boiler can be reset once. If 19 comes back, stop resetting: the underlying cause is still there and needs a qualified heating engineer.