BoilerFaultCodesIdeal Overheat thermostat Fault Code
Also written as OVERHEATTHERMOSTAT — same fault.
The Ideal Overheat thermostat fault code means: your boiler has switched itself off because it has detected an unsafe rise in internal temperature and needs a professional to check it is venting heat correctly.. It appears on 3 Ideal models in our database.
Technical description: The control has diagnosed a fault with the overheat thermostat.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like Overheat thermostat: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ideal models that show the Overheat thermostat fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Overheat thermostat fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal Classic Slimline FF 330 360 manual (PDF)
- Ideal Concord CXC 48 116 manual (PDF)
- Ideal Concord Cxdi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026