Worcester Heatslave 12-18, power but no lockout. Won't start.

[Mike2007]

This 12-18 heatslave has power but no lockout.
Motor runs
New PCB fitted
No power to syncronos motor to move valve and trip micro switch.
No activity on either channel to get burner going.
I have pressed all manual reset thermostat buttons.
What is the stumbling block?

 

[Mike2007]

Any professional help would be appreciated.

 

[CountryFan]

Either programmer not sending switch live or cylinder/room stat. Test voltages

 

[Mike2007]

Either programmer not sending switch live or cylinder/room stat. Test voltages

Thanks for that.
A heatslave is a combination oil boiler. Voltage isn't getting to the integral three port actuator.

 

[ericmark]

A heatslave is a combination oil boiler. Voltage isn't getting to the integral three port actuator.

Your heatslave may well be a combination boiler, my heatslave is not. It seems there are many versions of the heatslave range, and I can't help with your version, sorry.

 

[CountryFan]

Thanks for that.
A heatslave is a combination oil boiler. Voltage isn't getting to the integral three port actuator.

Ok, thanks. Not all heat slaves are combi’s. Still I’ve just looked in the mi’s, following the schematic, it looks like voltages can still be tested.

 

[oilhead]

What burner is fitted? If the motor runs on a Riello burner, then often it is a photocell fault. Why this could stop any movement on the diverter I don't know unless there are actually 2 faults. A faulty programmer can also produce peculiar symptoms.
It's time to get out the mulimeter and run through thefault finding chart.

 

[Mike2007]

What burner is fitted? If the motor runs on a Riello burner, then often it is a photocell fault. Why this could stop any movement on the diverter I don't know unless there are actually 2 faults. A faulty programmer can also produce peculiar symptoms.
It's time to get out the mulimeter and run through thefault finding chart.

Thanks.
The micro switch within the actuator head is live, which is strange. Although there is no power to the syncronic motor. I'm going ot try a fly wire to loop out various thermostats to try to get a burner fire. The photocell doesn't even get a chance as power doesn't get to it at this time.

What burner is fitted? If the motor runs on a Riello burner, then often it is a photocell fault. Why this could stop any movement on the diverter I don't know unless there are actually 2 faults. A faulty programmer can also produce peculiar symptoms.
It's time to get out the mulimeter and run through thefault finding chart.

It was a dead flue thermostat.