Worcester Greenstar Heatslave 18 25 Problems

The Worcester Greenstar Heatslave 18-25 boiler is a popular heating solution. However, like all appliances, it can occasionally face some challenges. Here’s a breakdown of a specific issue some users have encountered with this boiler and some potential remedies:

The Problem

1. The direct wired Honeywell thermostat seems to be working, calling for both heat and hot water.
2. There is a full oil tank, and the Tigerloop contains oil.
3. The boiler has suddenly stopped working.
4. There’s no lockout. Upon switching on, one can hear a switch followed by a gentle fan noise, but no pump action is observed. This means the boiler does not even attempt to fire up.
5. Standard resets do not offer a solution.
6. There are doubts about whether it’s a solenoid, an electrical fault, or perhaps the pump malfunctioning.

Suggested Solutions

1. Photo Cell Issue:
   • It was suggested to check the Photo Cell, which could be covered with soot, hindering its function.
   • If the burner is a Riello, the solution could be to unplug the photocell from the control box and restart the burner. If it lights and then goes to lockout, replacing the photocell might be the answer.
   • Accessing the photocell could require the removal of the control box lid, which is held by a single screw.
2. Oil Flow:
   • One might need to ensure that the oil is getting through. Potential issues could be water getting into the pipe due to condensation in the tank during the summer, or muck in the tank blocking the tank filter, especially after recent refills.
   • The presence of oil in the Tigerloop does suggest good oil flow, but if there’s any doubt, it might be necessary to inspect if the oil is indeed flowing to the pump.
   • The Tigerloop operates as an oil de-aerator that has non-return valves, enabling the burner pump to function as a fuel supply pump, especially when the supply is lower than the appliance.
3. Checking Limit Stats:
   • Underneath the control panel, there might be two or three manual reset buttons. These buttons are brown plastic with a cross and should be labeled. Pressing them to see if they click could potentially resolve the problem.
4. Solenoid or Oil Pump Issue:
   • If there’s no lockout and the boiler isn’t firing up, it might be due to the solenoid or the oil pump. If the oil pump was operational, the Tigerloop would likely fill with oil.
5. Checking Other Components:
   • Ensuring that the overheat stats underneath the control panel below the thermostat knobs are functional can be another avenue to explore.
   • Reset buttons, located either on the boiler housing or a separate unit on the wall, should be checked to ensure proper functionality.

Conclusion

While the above suggestions might help address the issue, it’s essential to remember that if you’re unfamiliar with boiler systems, you should seek the expertise of a qualified technician. Working on boilers without proper knowledge can be dangerous and might further damage the system. Always prioritize safety and professional advice when dealing with technical and potentially hazardous equipment.