BoilerFaultCodes 01
Ignition failure
Alpha E-Tec Plus 38 Fault codes & diagnostics
32 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 28-33 kW 2018-present
GC Number 47-532-79
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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. 32 Unrated
Just want the most common Alpha E-Tec Plus 38 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 32 documented codes
Tap any card for details
02
Overheat boiler lock out
03
High flue temperature
04
Gas valve electrical connection fault
05
CH flow sensor fault
06
DHW sensor fault
08
Max. number of resets
10
Primary system pressure low
12
DHW inlet sensor fault
15
Incorrect configuration
Showing 11–20 of 32
16
Fan fault
20
Flame sensing fault
22
PCB fault
23
Return sensor fault
24
Control panel button fault
25
PCB fault
27
Primary circuit overheat
29
Flue sensor fault
31
Loss of communication with
37
Low supply voltage
Showing 21–30 of 32
38
Loss of flame rectification
43
Loss of flame rectification
45
High )T
47
Reduced burner output
51
Climatic RF communication fault
60
Pump fault
61
Air in the pump
70
Return/flow sensor error (return reading higher than flow)
75
Return/flow sensor fault
76
Return/flow sensor fault
Showing 31–32 of 32
n
Boiler completely turned off
Sr
Service reminder
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