Post 1: Vaillant Ecotec Fault Codes: Which Parts You Need
Meta Title: Vaillant Ecotec Fault Codes Guide | F22, F28, F75 Solutions
Meta Description: Quick guide to common Vaillant Ecotec fault codes and the exact replacement parts you need. F22 pressure issues, F28 ignition faults, F75 pump problems solved.
Content:
When your Vaillant Ecotec boiler displays a fault code, knowing which part to replace can save you time and a second callout. Here's your quick reference guide to the most common Ecotec fault codes and the parts you'll need.
F22 Fault Code: Low Water Pressure
The F22 error indicates insufficient water pressure in the system. While this often requires topping up the system, persistent F22 faults point to pressure sensor failure or a leak in the expansion vessel.
What you need:
- Pressure sensor replacement
Vaillant Ecotec Plus PCB 832 (if sensor communication fails)- Expansion vessel (check for waterlogging)
F28 Fault Code: Ignition Failure
F28 means the boiler has failed to ignite. This is typically caused by gas valve issues, electrode failure, or PCB faults.
What you need:
- Ignition electrode
- Gas valve (if gas flow is restricted)
Vaillant PCB 8000011877 or8000034818 depending on your model
F75 Fault Code: Pump Fault
The F75 error indicates the pump isn't being detected or has failed. Check for blockages, airlocks, or pump seizure.
What you need:
- Replacement pump (model-specific)
- Pressure sensor (false readings can trigger F75)
Pro Tip: Always check the boiler's installation manual for your specific Ecotec model (Plus, Pro, Exclusive) as part numbers vary.
Post 2: Ideal Logic Boiler Common Faults and Replacement Parts
Meta Title: Ideal Logic Boiler Faults: Troubleshooting Guide for Installers
Meta Description: Fix common Ideal Logic and Logic+ boiler faults. Ignition problems, PCB failures, and pressure issues - with exact part numbers.
Content:
The Ideal Logic range is popular for its reliability, but like all boilers, certain components wear out over time. Here's what to look for when diagnosing common Logic faults.
Ignition and Flame Failure
If your Logic boiler won't ignite or loses flame intermittently, the electrode is usually the culprit. Carbon buildup or electrode wear prevents proper spark generation.
What you need:
PCB Failures
The Logic PCB can fail due to power surges, moisture ingress, or component degradation. Symptoms include random lockouts, display errors, or complete failure to power on.
What you need:
Low Pressure Issues
Persistent low pressure warnings often trace back to expansion vessel failure or pressure relief valve leaks.
What you need:
Installer Tip: When replacing the PCB, take a photo of all wire connections before removal. The Logic's wiring harness can be tricky to reconnect without a reference.
Post 3: Baxi Duo-Tec Troubleshooting: Diverter Valves, Fans & PCBs
Meta Title: Baxi Duo-Tec Troubleshooting Guide | Common Faults & Parts
Meta Description: Solve Baxi Duo-Tec boiler problems fast. Diverter valve issues, fan faults, and PCB failures explained with replacement part links.
Content:
Baxi Duo-Tec boilers are workhorses, but certain components are known failure points. Here's how to diagnose and fix the most common issues.
Diverter Valve Problems
No hot water but heating works? That's classic diverter valve failure. The Duo-Tec uses a motorized diverter that can seize or develop leaks.
What you need:
Baxi 243341 Diverter Valve Plastic Baxi 247310 Diverter Valve Body HE Plus Baxi Bahama 100 Diverter Valve Repair Kit 241361 (for older models)
For Combi Instant models:
Fan Faults
If the boiler locks out before ignition with a fan-related error, check for blockages in the flue, failed fan bearings, or air pressure switch issues.
PCB Issues
Random lockouts, intermittent operation, or display glitches usually point to PCB failure. Check for burn marks or capacitor bulging.
Pro Tip: Before replacing the diverter valve, check if just the motor head needs replacing - it's a cheaper fix if the valve body is sound.
Post 4: Worcester Greenstar Fault Codes Explained
Meta Title: Worcester Greenstar Fault Codes & Parts Guide for Installers
Meta Description: Decode Worcester Greenstar error codes and find the right replacement parts. Electrode kits, heat exchangers, and common fixes.
Content:
Worcester Greenstar boilers are among the UK's most installed, and knowing the common fault codes saves diagnostic time on every job.
EA Fault Code: Flame Detection Failure
The EA error means the boiler can't detect a flame. This is almost always electrode-related.
What you need:
-
- Brand new
Worcester FS 30/FS 42 CDi Electrode Kit 87181070890 Worcester 871860028A0 Spark & Ionisation Electrodes Set
E9 Fault Code: PCB Communication Error
E9 indicates the PCB has lost communication with a component, often the display or a sensor.
What you need:
Low Pressure (Flashing Spanner)
Persistent low pressure on a Greenstar usually means expansion vessel failure.
What you need:
Installer Note: Always verify the exact Greenstar model (CDi, Si, i Junior, etc.) before ordering electrodes - Worcester uses different kits across the range.
Post 5: How to Choose the Right Expansion Vessel for Your Boiler
Meta Title: Boiler Expansion Vessel Guide: Sizing & Replacement
Meta Description: How to select and replace a boiler expansion vessel. Sizing guide, pressure testing, and brand-specific recommendations.
Content:
The expansion vessel is one of the most overlooked components in a heating system, yet it's critical for maintaining stable pressure and preventing safety valve discharge.
What Does an Expansion Vessel Do?
As water heats up, it expands. The expansion vessel absorbs this extra volume, preventing dangerous pressure buildup. When the vessel fails (usually due to diaphragm rupture), you'll see constant pressure drops or water discharging from the PRV.
Signs Your Expansion Vessel Has Failed:
- Frequent need to top up system pressure
- Pressure gauge reading too high when heating is on
- Water dripping from pressure relief valve
- Vessel feels heavy (waterlogged) when tapped
Choosing the Right Size
Most domestic boilers use 8-12 litre vessels, but always check your boiler's manual. Oversizing slightly is better than undersizing.
Brand-Specific Replacements:
Worcester 87186506550 Expansion Vessel Worcester 8716122887 Expansion Vessel IDEAL Expansion Vessel 175551 Varem 50 Litre Expansion Vessel (for larger systems)Expansion Vessel Hose (replacement connection)
Installation Tip: Pre-charge the new vessel to match your system's static pressure (usually 1.0-1.5 bar) before installation for optimal performance.
Post 6: PCB Exchange vs Direct Sale vs Repair: Which Option Is Right for You?
Meta Title: Boiler PCB Replacement Options: Buy, Exchange or Repair?
Meta Description: Should you buy a new PCB, use an exchange service, or get yours repaired? Cost comparison and pros/cons for installers.
Content:
When a boiler PCB fails, you have three options: buy new, exchange, or repair. Each has advantages depending on the job, customer budget, and urgency.
Option 1: Buy Brand New
Pros: Guaranteed compatibility, full warranty, no waiting
Cons: Most expensive option
Best for: Warranty jobs, high-value customers, or when you need the part immediately
Available new PCBs:
Ideal 182321 V4 Logic PCB Std Kit Worcester Bosch 8716122561 5 PCB Control Unit Vaillant Ecotec Plus PCB 832 Main 7679739 PCB System 28 Eco
Option 2: Reconditioned/Exchange PCBs
Pros: 40-60% cheaper than new, tested and guaranteed
Cons: May require sending old PCB back, limited stock
Best for: Budget-conscious customers, older boiler models where new PCBs are expensive
Available reconditioned:
Option 3: PCB Repair Service
Pros: Cheapest option (30-50% of new price)
Cons: Turnaround time (3-5 days), not all faults are repairable
Best for: Non-urgent jobs, discontinued models, or when the customer wants to minimize cost
Our Recommendation:
For emergency breakdowns, stock new PCBs for common models (Ideal Logic, Worcester Greenstar, Vaillant Ecotec). For planned maintenance or older boilers, reconditioned units offer excellent value. Always explain the options to your customer and let them choose based on budget and urgency.
Installer Tip: When removing a failed PCB, photograph all connections and check for obvious damage (burn marks, blown capacitors). Sometimes a simple component-level repair is possible on-site.
