Ideal Logic showing E133 fault code? Here’s what you can check yourself:
DIY Checks You Can Do
Check gas supply
Try your gas hob or cooker. If they don’t work either, contact your gas supplier immediately.
Check gas valve at boiler
Find the yellow handle on the gas pipe. Make sure it’s in line with the pipe (open), not across it (closed).
Try resetting once
Press the reset button. If E133 returns immediately, don’t keep resetting – you need an engineer.
Check for frozen condensate
In cold weather, check the white plastic pipe outside for ice. Pour warm (not boiling) water over it to thaw.
Listen for ignition clicks
When the boiler tries to fire, you should hear clicking. No clicking suggests an electrode or electrical fault.
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Call 0800 328 0449 nowWhat Does Ideal Logic E133 Fault Code Mean?
The Ideal Logic E133 fault code means flame loss or flame failure. Your boiler tries to light the gas burner, but either the flame doesn’t establish or it lights briefly then goes out. After multiple failed attempts (usually 3–5), the boiler displays E133 and locks out for safety.
What’s happening: The boiler goes through its ignition sequence, opens the gas valve, sparks the electrodes, but no stable flame is detected. The ionisation probe either doesn’t sense a flame or senses one briefly before it’s lost.
Common on these models: Ideal Logic (24, 30, 35 kW), Logic Plus, Logic Max, and older Logic Code models.
Safety feature: E133 prevents continued gas release without proper ignition.
E133 vs similar codes: E125 (overheat), E128 (no flame at start-up), E219 (fan fault).
What Causes Ideal Logic E133 Fault Code?
1. No gas supply
Smart meter off/no credit, valve closed, network interruption, meter/regulator issue.
Signs: Other gas appliances fail too.
2. Faulty flame detection electrode
Dirty, misaligned, cracked insulator, worn.
Signs: Brief flame then E133, yellow/orange flame.
3. Ignition electrode fault
Worn tip, wrong spark gap (typically 3–4 mm), broken ceramic, wiring fault, PCB not driving.
Signs: No clicking, weak/intermittent clicking.
4. Gas valve not operating
Stuck, failed solenoid, perished diaphragm, wrong pressure.
Signs: Clicking but no ignition “whoosh”.
5. Low gas pressure
Regulator or supply issue, undersized pipework, peak-time drop.
Signs: Weak hob flames, intermittent E133.
6. Frozen condensate pipe
External pipe iced in freezing weather.
Signs: Gurgling, E133 only in cold snaps.
7. Flue blockage/air supply issue
Bird nests, debris, iced terminal, dislodged flue.
Signs: Sudden E133, sooty deposits.
8. Fan fault
Fan too slow/not running; air pressure switch not proving.
Signs: No fan whirr; E219 may appear.
9. PCB or wiring fault
Age, heat, moisture, surge damage.
Signs: Multiple random errors, flickering display.
10. Burner/combustion chamber issues
Blocked burner, failed seals, scaled exchanger.
Signs: Kettling noises, sooty deposits.
How to Diagnose Ideal Logic E133 Fault Code
Step 1: Verify gas supply
Check hob/cooker. If they fail, call your gas supplier. If fine, continue.
Step 2: Check gas valve position
Yellow lever parallel to pipe = open. After opening, wait 5 minutes, then reset.
Step 3: Listen for ignition
Clicking heard = sparks present. No clicking = electrode/electrical fault.
Step 4: Check for frozen condensate (winter)
Thaw the external white pipe with warm (not boiling) water; then reset.
Step 5: Observe flame behaviour
Brief flame then E133 = sensing issue. No flame at all = ignition/gas issue.
Step 6: Check fan operation
Listen for the fan whirr. If absent or intermittent, likely a fan/APS fault.
Step 7: Try one reset
If E133 returns straight away, stop resetting and call an engineer.
How to Fix Ideal Logic E133 Fault Code (DIY)
Fix 1: Thaw frozen condensate pipe
Use warm water along the full external run. Insulate afterwards to prevent repeats.
Fix 2: Open gas valve
Set the yellow lever parallel with the pipe, wait 5 minutes, then reset.
Fix 3: Purge air after supply interruption
Briefly light the hob/cooker to purge air, then reset the boiler.
Fix 4: Check flue terminal (outside only)
Remove obvious external debris/ice. Do not dismantle the flue.
How Engineers Fix Ideal Logic E133
Diagnostics: Combustion analyser, multimeter, manometer, PCB fault history, air pressure checks, visual inspection.
Common repairs and typical totals:
Clean/replace flame sensor: £60–£140
Replace ignition electrode: £90–£180
Gas valve replacement: £230–£420
Burner clean/combustion service: £100–£200
Fan replacement: £200–£340
Flue clearance: £60–£150
PCB replacement: £280–£500
Most E133 cases are solved with electrode clean/replacement.
Prevention Tips
Annual boiler service
Electrodes cleaned/checked, gas pressures verified, combustion and flue tested (typically £70–£90).
Insulate condensate pipe
Use thick foam lagging along the full external run.
Fit a bird guard to the flue
Prevents nesting-related blockages.
Run the boiler regularly
Short monthly heating runs even in summer keep parts free.
Maintain system inhibitor
Protects against corrosion that can affect combustion components.
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