Why is the pump running constantly on a Greenstar CDi boiler?
The pumps on the Greenstar CDi range have a permanent live feed to them. If the pump is always running, there are generally 3 causes for this:
- The speed control wire (purple, white and black) going to the pump is damaged - check continuity and connection.
- The boiler has a weather compensating controller fitted (FW100 or Wave smart internet connected controller). The pump will run constantly to monitor the flow temperature and maintain heat curve.
- The PCB is faulty and telling the pump to run when it should not be running.
More Gas Boiler FAQs
- Is an external air break required when a condensate pipe is terminated into a rainwater downspout?
- How do I re-route a condensate pipe to reduce the external run?
- Where can I find the FD (serial) number on a Greenstar boiler?
- Can I fit your controls to an external oil boiler?
- Can I run boiler flues outside?
- Does an external condensate pipe have to be insulated?
- Which programmers are compatible with my gas boiler?
- Can I put flue elbows straight on top of the boiler?
- Do I need a standoff kit to pipe up the back of your boilers?
- Why is the boiler blowing fuses?