172-65167MA-10 (VA1/VA3/VA4/VA5) 1 Oct 2021
11
Troubleshooting
NEVER apply direct heat to the float.
The float may explode due to increased internal pressure, causing accidents
leading to serious injury or damage to property and equipment.
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product has
cooled to room temperature.
Disassembling or removing the product when it is hot or under pressure may
lead to discharge of fluids, causing burns, other injuries or damage.
When the product fails to operate properly, use the following table to locate the cause
and remedy.
Problem
Cause
Remedy
No air is
discharged
(blocked)* or
discharge is poor
The trapped air cannot displace the
water in the piping
Correct the inlet piping
The valve seat is clogged with dirt or
foreign matter
Clean the valve seat
The inlet or outlet piping is clogged Clean the piping
Water leaks when
the vent is closed
There is a build-up of rust or scale
on the valve seat or the valve seat is
damaged
Clean or replace with a new valve
seat
The float is misshapen, dirty or has a
film build-up
Clean or replace with a new float
The installation angle of inclination is
incorrect
Correct the installation
The vent does not
close and water is
blowing
The float is damaged or filled with
water
Replace with a new float
The specific gravity of the liquid is
outside the specifications for this
product
(This product is for water system)
Select a product with suitable
specifications for the operating
conditions
* NOTE: Once the air vent closes, it will remain closed until internal pressure drops to near or
below atmospheric pressure. This condition may be confused with a malfunction
(blocked). If air is expected to accumulate in the piping during operation, use
together with an automatic air vent.
WARNING
CAUTION
