Trying to fix my shower

[Booldawg]

My bathroom is fitted with a power shower that hasnt worked since we bought the house off the previous occupants.

I immediately thought it may be the pump/motor but not so sure now.

In between the pump and mains supply is a transformer that takes in mains supply and drops it down to 11.5v DC. I noticed the 15a blade fuse in the transformer had blown. I fitted a new fuse that lasted about 2 seconds before blowing. The label on the transformer says it has to be a 10a LV fuse. As I dont have any 10a fuses I've not tested that yet.

My theory is someone fitted a 15a fuse because it kept blowing the 10a ones - obviously not rectifying the problem.

What would cause fuses to continualy blow? Could it be the pump or transformer itself?

[The Builder]

possibly the pump has seized up Booldy...........can you get in there and turn the spindle?

[buildersmate]

Just to clarify, this fuse is on the LV side.
It isn't going to be an issue with the transformer, which is upstream of the fuse. The fuse is in there to protect the Tx from being overloaded by a faulty pump. Agree with the Builder - a jammed pump will drive the current demanded up (and will quickly weld the motor brushes to the armature of the motor). Don't be tempted to fit a larger fuse or you may end up having to replace the Tx as well.

[Booldawg]

Thanks for the answers. I'll have a look at the state of the pump. Without looking I guess its made up of a motor and impeller.

[buildersmate]

Exactly - motor on one side - separated from the waterproof impeller in its own housing with a O-ring or similar to keep water from the motor side.