Testing Triton shower safeguard low pressure shower pump motor testing fault finding T90xr T150z

These motor are AC universal brushed motors to test just test the windings both sides after disconnecting brushes ( check brush length while you do this and replace if needed ).

On this model the brushes connect via retaining spring so i disconnected this to isolate the windings for testing , test with meter set to ohms and measure, I read roughly 18 ohms each side.

Next check the rotor over for signs of damage and burn or overheating signs or even smells , then test from segment to segment all around the commutator until every pair have been tested, they should all be very similar readings.

You can then dismantle the the pump from the motor to inspect it for internal damage.

Buy electric shower parts on Ebay UK here

Need a Multimeter for testing try on Ebay UK here

Hook back the brush springs this will remove electrical contact from brushes good time to check or replace the brushes , these are good so no need 

Here i test both winding one each side the reading should be very similar here they are exact so very good winding on this motor

above you can see the segments of the commutator on the rotor

you need to test the ohms value between  segment and the next one to it above is 6.2 the next 4.3 this could be a bad sign or just a dirty commutator so clean it off first with some contact cleaner and even wire wool

Now do this to every next pair of segments all round the commutator 

if motor checks out you now can visually inspect the pump on the motor 

check internal impellers 

This is the bleed nipple for bleeding the pump when commissioning 

See video of this process below 

And video below shows insulation resistance testing or PAT testing on motor which was tripping the electricity supply.

above shows 120 Mohm a good enough reading but below is less than 1 Mohm so dangerous