Overview of Primary Product

ManualsBrandsUponor ManualsHeating SuppliesTime Delay Fuse (600V, 15A, Class CC)

www.uponorpro.com

Issue Cause Solution

Unit not

turning off

1. Thermostat setting is too high

2. Faulty controls

3. Faulty boiler

4. Faulty wiring

1. If the thermostat(s) setpoint(s) are incorrectly set too high, there will

be a call for heat and the boiler will continue to heat the area until the

thermostat is satisfied.

2. If the thermostat is wired incorrectly, the boiler may see the

thermostat/relay as calling for heat, when in reality there is no call.

3. If the Boiler is wired incorrectly, the boiler may see the

thermostat/relay as calling for heat, when in reality there is no call.

4. If the power coming into the unit and thermostat is incorrectly wired,

the unit will not function properly.

Uneven heat

(between

rooms, within a

room)

1. Thermostat setting

2. Loop isolation valves (return

manifold) not fully open

3. Loops improperly balanced

4. Wrong pump setting

1. If the thermostat(s) setpoint(s) are incorrectly set too high or low,

one zone will shut down once the thermostat is satisfied.

2. If the loop isolation valves are not completely open, certain loops may

experience less flow than the design requirements.

3. If the loops are not balanced properly, certain loops may experience

more or less flow than the design requirements; this may also cause

certain loops to have more flow than others.

4. If the pump setting is incorrectly set too high or low, there may not

be enough energy to move the fluid through the system.

T&P relief

valve (PRV)

issues

1. Repeated opening

2. Won’t open at all

1. If the T&P relief valve continuously opens and closes, this may indicate

the system pressure is above 30 psi. This could be due to auto fill

pressure being too high, the pump being incorrectly set and creating

too much pressure in the system, or the boiler overheating the water

and creating steam.

2. If the T&P relief valve will not open when the system pressure increases

above 30psi, this indicates that either the PRV is sealed shut with

sediment or is incorrectly set above 30 psi.

Troubleshooting (continued)