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MV100 ELECTRIC CONTROLLERS T100, T200 THERMOSTATIC CONTROLLERS AND V2000 RADIATOR VALVES
62-3048—2
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TROUBLESHOOTING
Refer to Table 6 for troubleshooting details.
Table 7. T100/V2000 Troubleshooting.
Symptom
Possible Cause
Solution
Not all sections of the 
radiator are heating.
Many radiators are oversized and 
not all sections heat to maintain 
the desired temperature.
System is operating properly.
Underheating
Sensor in the wrong location.
Change the sensor location or change the control type. See 
Installation Instructions.
T100A,M Controller mounted in a 
vertical position above the hot 
pipe.
Mount the T100A,M horizontally, or switch controller to a T100F.
Excess capillary tubing coiled 
above or too close to the heat 
source.
Coil excess capillary tubing below or away from the heat source.
Flow through the valve is in the 
wrong direction.
Check the arrow on the valve body. It should be in the direction of 
the flow. Change the valve direction or flow direction.
Inadequate system temperature or 
pressure.
Check boiler operating and limiting controls, circulating pump, and 
isolating valves.
Defective steam traps.
Repair or replace the traps.
Airlock in the hot water system.
Fully open the valve to allow air to pass. Install vents.
Scale or debris blocks flow.
Flush the system. Do not use oil-based additives. Clean strainer 
insert in steam applications.
Heating cabinet dampers are 
closed.
Open or remove the dampers.
Single-pipe: Blocked vent.
Remove and inspect vent. Replace if necessary.
Overheating
Sensor in the wrong location.
Change sensor location or change control type.
Control not properly installed.
Check for bosses and grooves, reset actuator on valve and tighten 
knurled ring to valve body.
Capillary tube broken, kinked or 
bent sharply.
Replace control.
Dirt or scale under the seat 
prevents tight shutoff.
Remove the control from the valve body, allowing valve to open 
fully and flush away scale and debris. Reinstall control. Turn fully 
clockwise. If the valve does not close fully, remove the control and 
cartridge (see Cartridge Replacement section). Always use a 
strainer insert in steam applications.
Flow through the valve is in the 
wrong direction, damaging the 
valve seat.
Check the arrow on the valve body. It should correspond to the flow 
direction. Change the valve direction or flow direction. Remove 
valve cartridge and inspect seat disk for damage.
Defective steam traps.
Repair or replace traps.
Excessive differential pressure 
forces the valve open (hot water 
systems).
Install differential pressure regulator (D146A) to maintain less than 
15 psi (103 kPa) differential between the supply and return pipes.
Single-pipe: Insufficient air in 
system.
Check boiler cycling and system vacuum breakers. Repair or 
replace breakers as necessary.
Chattering or knocking. Flow through the valve in the 
wrong direction.
Check the arrow on the valve body. It should correspond to the flow 
direction. Change the valve direction or flow direction.
Vacuum in the system.
Steam—check traps and vents.
Hot water—check expansion tank operation and location.
Excessive differential pressure.
Install differential pressure regulator (D146A) to maintain less than 
15 psi (103 kPa) differential between the supply and return pipes.
Bent piping.
Ensure adequate space for piping.