Overview
The rE error on a Worcester Bosch GB162 typically indicates that the boiler is in a reset condition or is repeatedly resetting/locking out because it has detected a fault. In practice "rE" is not a specific component failure code but a symptom: the boiler has shut down and shown the reset state to protect itself. Causes can be varied — common underlying problems that force repeated resets include blocked condensate pipe or pump, flame or ignition faults, sensor/thermostat errors, overheating or circulation problems, or an intermittent electrical/gas supply issue. Severity ranges from low to high depending on the underlying cause. If the boiler simply reset once and runs normally after you press the reset button, it may have been a transient issue. If the boiler is repeatedly resetting, locking out, showing other fault codes (EA, E2, E9 etc.), leaking, overheating, or you smell gas, treat it as a serious fault and stop using the appliance. Some initial checks and basic actions are reasonable for a homeowner, but diagnosing and repairing most root causes (ignition/flame hardware, gas valve, internal sensors, PCB, sealed components) must be done by a Gas Safe registered engineer. Never attempt to repair gas components or internal electrics yourself.
Possible Cause: The boiler resets.
Troubleshooting Steps
Safety first
- If you smell gas, leave the property immediately and call the gas emergency line. Do not operate electrical switches or the boiler. Call a Gas Safe engineer.
- If there is any sign of water leak, electrical burning or overheating, isolate the boiler electrical supply at the fused spur and call a qualified engineer.
- Do not open boiler covers or attempt internal repairs unless you are a Gas Safe registered engineer.
Initial checks a homeowner can safely do
1. Note and photograph the display: write down rE and any other symbols or flashing lights and the time it happened. This information helps an engineer.
2. Try a controlled reset: follow your manual for the GB162 — usually press and hold the reset button or the return/spanner button for about 3–5 seconds. If the boiler clears and runs normally, monitor it closely for recurrence.
3. Power-cycle: switch the boiler off at the fused spur, wait 30 seconds, then switch back on. Some control faults clear with a power cycle.
4. Check other utilities and controls: ensure central heating thermostat/timers are calling for heat, check that the mains electrical supply and fuse spur to the boiler are OK, and verify other gas appliances are working (if not, there may be a gas supply issue to investigate with your supplier).
5. Check boiler pressure: if the system pressure is very low (<1.0 bar) or very high (>2.5 bar) the boiler may behave oddly. Re-pressurise per the manual only if you are comfortable doing so.
6. Inspect external condensate pipe (in cold weather): if the condensate pipe has frozen or is visibly blocked, thaw it using warm (not boiling) water along the outside run or clear blockages at the external termination. Condensate blockages commonly cause lockouts on modern condensing boilers.
Diagnostic steps to gather useful information before calling an engineer
1. Access the information/cause code: when the boiler is in a blocking/lockout state press the spanner/return button (or consult the manual for entering the info menu) to display a three-digit cause code. Record that cause code — it gives the engineer a direct clue to the root fault (eg E2, E9, D1, EA codes in Worcester lists).
2. Observe behaviour: does the boiler try to ignite several times then lock out (common with flame/ignition faults)? Does it shut down when pumping starts (circulation/pump fault) or when flow temperature rises quickly (possible flow/sensor or circulation issue)? Note any symptoms and timings.
3. Check condensate pump and trap: if accessible and safe to do so, check the condensate trap/pump for blockages or faults (some models have an external condensate outlet or small pump). If you suspect the condensate pump has failed or the trap is blocked, record that and do not attempt invasive repairs.
4. Look for related fault codes or symbols: if other alphanumeric codes appear alongside rE (for example EA, E2, E9, D5 etc.), record them — different codes indicate flame detection, sensor shorts/opens, condensate pump failure, overheating, etc.
When to call a professional and what to tell them
- Call a Gas Safe registered engineer if the rE condition repeats, the boiler locks out more than once, any other fault code appears, there is a gas smell, visible water leak, overheating, or you are unsure. Provide the engineer with: the rE display, any three-digit cause code from the info menu, any other fault codes or symbols, when the problem occurs (startup, during a hot water call, during heating), and what preliminary actions you have already taken (reset, thawed condensate, power-cycled).
- Do not reset repeatedly as a permanent fix. Repeated resets can mask a developing fault and allow unsafe operation.
Final notes
- rE is a symptom (reset/lockout) not a precise diagnosis. The cause code in the information menu and any accompanying fault codes are needed to identify the exact failure.
- Only a qualified Gas Safe engineer should carry out internal component tests, sensor replacements, gas valve or flame detection work, or PCB repairs. If in doubt, arrange a professional inspection rather than continuing to operate the boiler.
Helpful Resources
Boiler Manual
Download the official PDF manual for the Worcester Bosch GB162 Boiler.