Water at 75°+ from heater = thermostat broken, not shutting off at target. SEVERE danger for children/elderly (serious burns in seconds).
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Water too hot (scalding) — ranked from most to least common.
Failed thermostat not shutting off
Failed thermal cut-out switch
NTC sensor reading too low
Setting too high (85°+)
Short between thermostat and heater
Faulty control board
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.