Heatslave 20/25 lockout

markadams · Feb 4, 2019

Hi,

My oil boiler has just locked out, pressed the reset button on the burner and it doesn't light and just locks out again after a minute.

It has plenty of oil and has never run out.

Tried calling an oftec engineer and no one can come for a week, I repair lots of gas boilers but not experienced with oil.

SJB060685 · Feb 4, 2019

Do you know what burner it has?
When you say doesn’t relight does the motor run and goes through pre purge/start sequence?

SimonG · Feb 4, 2019

What does it do when you press the reset? Can you hear the fan running or does it Buzz?

markadams · Feb 4, 2019

Hi, thanks for the replies, when reset all I can hear is a buzz, I can't hear the fan.

SJB060685 · Feb 4, 2019

Could be capacitor, seized pump or bearings seized. Check capacitance on capacitor, any less than 70% original value I was told to change. Isolate fuel, take pump off and see if shaft spins freely, could be seized or have tight spot. While pump is off check electric motor shaft is free spinning.

MikeJhn · Feb 5, 2019

Before you start taking off oil pumps and the like, lift the air cover on the end of the motor and see if you can move the fan, if not something is seized and needs further investigation, if the fan moves then its probably the motor capacitor gone west.

SimonG · Feb 5, 2019

If your lucky it will be capacitor.

Try loosening grub screws where pump attaches to motor.

markadams · Feb 5, 2019

The fan, spins very freely, changed the capacitor and still the same.

Best · Feb 5, 2019

markadams said:
The fan, spins very freely, changed the capacitor and still the same.

If the fan spins freely while the motor and oil pump are still attached, then nothing is seized.
Then if motor and fan will not turn and just a hum noise, the motor is faulty.

SJB060685 · Feb 5, 2019

If the motor is spinning freely and no tight spots and had feed to motor and the cap is replaced like for like ie. right uF value then like best says it’s probably the motor, windings burnt out? If you replace motor check data plate on it to get right model and wattage