313 POWER CIRCUIT BOARD 1 P.B
The E82 error code on Mitsubishi boilers indicates 313 power circuit board 1 p.b.
Mitsubishi E82 means: 313 power circuit board 1 p.b. On this component the documented failure modes are wiring, connector or harness of the control board damaged or loose or control board (pcb) faulty. You can safely reset the boiler once — if E82 returns, do not keep resetting. A qualified heating engineer should diagnose the root cause.
What Does E82 Mean
The E82 code is shown by the boiler’s control board when it detects 313 power circuit board 1 p.b. 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 E82 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 |
|---|
| Wiring, connector or harness of the control board damaged or loose |
| Control board (PCB) faulty |
Safety Warning
E82 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
Note the exact error code and check the manufacturer's installation and service manual for specific guidance
Check all visible wiring connections for security and condition
Power cycle the boiler — switch off at the mains for 30 seconds, then switch back on
If the fault recurs, check the fault history for related or recurring codes
Inspect the boiler for any obvious signs of damage, leaks, or unusual sounds
How to Fix It
Reset the boiler after investigation
repair any loose connections or damaged wiring
replace the faulty component identified during diagnosis
if the fault persists after basic checks, contact a qualified heating engineer with the exact error code
Unplug and re-seat the connector of the control board, then check the harness for chafing, corroded pins and breaks in continuity.
Only after every other check: verify the board’s supply and connections, and replace the board — fitting the correct boiler chip card or coding key where the model requires one.
Refer to the Mitsubishi service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
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Affected Models
Mitsubishi models that can display fault code E82:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Mitsubishi models | — | Possible |
Frequently Asked Questions
Reset the boiler after investigation. According to the technical documentation, this is the first check on the list for E82.
E82 is not classified as a high-severity fault, so the boiler can be reset once. If E82 comes back, stop resetting: the underlying cause is still there and needs a qualified heating engineer.