What does the Heatline d.16 fault code mean?

Your boiler is simply reporting the current signal status from your wall-mounted thermostat to indicate whether it is asking for heat.

How much does it cost to fix Heatline error code d.16?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Heatline d.16 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Current state of the 24V room thermostat

Shared across the Monza range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

DIY fix possible

Check your room thermostat to see if it is set to a higher temperature than the current room temperature.Replace the batteries in your room thermostat if it is a wireless or digital model.Ensure the thermostat is not set to an 'Off' or 'Summer' mode if you are trying to turn the heating on.

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Boiler cover options

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Related fault codes

d.17View →

All 111 fault codes on the Monza

Seeing a different code? Every code this model can display, in one place.

d.00 d.01 d.02 d.08 d.09 d.10 d.17 d.18 d.20 d.22 d.23 d.33 d.34 d.35 d.36 d.40 d.41 d.44 d.67 d.68 d.69 d.71 d.80 d.81 d.82 d.83 d.85 d.93 d.94 d.96 Err F00 F01 F10 F11 F20 F22 F23 F24 F26 F27 F28 F29 F32 F49 F61 F62 F63 F64 F65 F67 F68 F70 F71 F72 F73 F74 F76 F77 F83 F84 F85 F86 P.01 P.02 P.03 P.05 P.06 P.07 S.00 S.01 S.02 S.03 S.04 S.05 S.06 S.07 S.08 S.10 S.11 S.13 S.14 S.15 S.16 S.17 S.20 S.21 S.23 S.24 S.25 S.26 S.27 S.28 S.30 S.31 S.32 S.34 S.35 S.36 S.37 S.41 S.53 S.54 S.58 S.90 S.92 S.95 S.96 S.97 S.98

Your boiler is simply reporting the current signal status from your wall-mounted thermostat to indicate whether it is asking for heat.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 111 fault codes on the Monza

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