Hello and hope everyone is staying warm this winter!
I have 2 Grundfos circ pumps (1 per zone) on an old Triangle Tube Prestige 110 boiler on a house we purchased relatively recently. One of the pumps appears to not be circulating as that zone is not warming.
First I checked voltage to the pump and I am getting 120V when the thermostat calls for heat.
I pulled the large silver screw from the back of the pump housing and you can see the end of what I assume is the impeller. It has some marks on it as if it were meant to be turned with phillips or a screwdriver. When I put pressure on the end of the impeller it begins to turn under power from the motor. When you back of the pressure with the edge of the screwdriver it stops turning.
Said in another way it the impeller only begins to turn when there is moderate pressure on it. I understand that when you replace the silver end cap it will create some pressure on the end of the impeller.
I guess my question is...is this by design or is this a pump that is wearing out and needs replacement?
I have 2 Grundfos circ pumps (1 per zone) on an old Triangle Tube Prestige 110 boiler on a house we purchased relatively recently. One of the pumps appears to not be circulating as that zone is not warming.
First I checked voltage to the pump and I am getting 120V when the thermostat calls for heat.
I pulled the large silver screw from the back of the pump housing and you can see the end of what I assume is the impeller. It has some marks on it as if it were meant to be turned with phillips or a screwdriver. When I put pressure on the end of the impeller it begins to turn under power from the motor. When you back of the pressure with the edge of the screwdriver it stops turning.
Said in another way it the impeller only begins to turn when there is moderate pressure on it. I understand that when you replace the silver end cap it will create some pressure on the end of the impeller.
I guess my question is...is this by design or is this a pump that is wearing out and needs replacement?