Vokera Pinnacle System fault E020
Limit thermostat
Gas boilerWhat it means
Definitive error indicating the limit thermostat has tripped, usually due to overheating.
Likely causes
- System water pressure drop below required minimum value
- Fan speed fault
- Overheat detected by limit thermostat
- No flame signal detected
- Incomplete combustion or high emissions detected
- Flue gas threshold temperature exceeded
- Excess pressure in primary circuit
Where to start
- Check system water pressure against minimum required value
- Check fan speed sensor operation
- Check limit thermostat operation
The full answer, free
- 3 more checks in order
- The manual page for this fault (page 7), right under the answer
Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.
From the Vokera manual for the Pinnacle System. Check the model on the data plate before you order parts.
Other Vokera Pinnacle System fault codes
- COMAppliance PCB communication lost
- E010Maximum number of ignition attempts
- E011Parasitic flame
- E021Gas valve control malfunction
- E033Rotor fan failure damaged
- E034Chimney obstruction in preventilation
- E035Blockage obstruction flue gas low power
- E036Blockage obstruction flue gas high power
- E040Low water pressure (definitive fault/lockout)
- E041Low water pressure (temporary fault)
- E050Smoke obstruction error low power
- E051Smoke obstruction error high power
- E055No card fan communication
- E075Valve opening limit reached
- E077Absence of communication with low temperature thermostat
- E091Primary heat-exchanger cleaning fault
- E099Reset attempts exhausted
- FILLow water pressure (warning signal)