Ideal Vogue Boiler Fault Codes and Diagnostics This page is dedicated to diagnosing a flow thermistor fault lockout fault on the Ideal Vogue boiler. Fault: Flow Thermistor Fault Lockout Display Message Flow Thermistor Lockout Diagnostic Procedure Step 1 Disconnect the flow thermistor and test the resistance across its terminal pins.At 25°C expect a reading between … Continue reading Ideal Vogue Flow Thermistor Lockout