BoilerFaultCodes Excessive temperature on primary circuit
Excessive temperature on primary circuit
Biasi Riva Plus HE 28C ErP Fault codes & diagnostics
11 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Gas 2015-present
GC Number 47-583-42
Download the Biasi Riva Plus HE 28C ErP manual
PDF
Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 11 Unrated
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 47-583-42 | Riva Plus HE 28C ErP | 2015–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Biasi Riva Plus HE 28C ErP faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 11 documented codes
Tap any card for details
Faulty air pressure sensor
Faulty air pressure sensor
Faulty C.H. temperature probe NTC
Faulty C.H. temperature probe NTC
Faulty D.H.W. temperature probe NTC
Faulty D.H.W. temperature probe NTC
Faulty flue temperature probe NTC
Faulty flue temperature probe NTC
Faulty primary circuit
no water or low C.H. pressure
Flame detection error
Flame detection error
Flue temperature probe NTC lock out
Flue temperature probe NTC lock out
Lack of burner ignition
no ignition signal from the full sequence ignition device
Lack of power supply
Lack of power supply or faulty electronic control p.c.b.
Safety thermostat lock out
Safety thermostat lock out
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