Heating & Insulation
Grundfos Alpha2 Pump Noise Traced to Trapped Air and Silenced with a Spirotech Deaerator
A Grundfos Alpha2 that gurgles or rattles within seconds of starting is almost never a failing...
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Condensate Pipe Freeze Fault Cleared on a Vaillant ecoTEC with a 32mm External Upgrade
A Vaillant ecoTEC plus showing F.28, or failing to ignite without a code when the temperature...
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Flue Gas Losses Cut on a Vaillant ecoTEC by Retuning the Gas Valve to a Kane 458 Reading
A condensing ecoTEC that runs 200 to 300 parts per million of carbon monoxide too rich is losing...
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Cold Spots Cleared on a 10-Radiator System with an Adey MagnaClean Professional 2
A 10-radiator gravity-fed system with three upstairs radiators cold across the top usually has...
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4 Radiators Balanced with a Fluke 62 MAX Infrared Thermometer on a Two-Storey Loop
A Fluke 62 MAX reads surface temperature to within a couple of degrees, which is enough to sort...
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Nest Learning Thermostat: Why Room Temperatures Overshoot and How TRV Balancing Fixes It
A Nest Learning Thermostat uses one wall sensor to command a whole radiator circuit. If one...
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3 Bar Expansion Vessel Fault Traced on a Baxi Duo-Tec with a Rothenberger Gauge
A Baxi Duo-Tec sitting at 3 bar cold and dropping to 0.5 bar the moment the burner fires is not a...
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18 Litres of Sludge Removed by a Kamco CF90 Powerflush on an Eight-Radiator System
An eight-radiator system in a 1990s semi gave up 18 litres of black iron-oxide sludge to a Kamco...
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5 mm of Limescale Removed from a Heat Exchanger with a Sentinel X800 Rapid Cleaner
A 5 mm crust inside a plate heat exchanger can turn a cleanly modulating combi into a boiler that...
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