Troubleshooting Guide

** It is imperative to identify your Faucet model to determine the correct replacement part number(s), as the size and/or number of the replacement part(s) will vary from Faucet model to Faucet
model. Please see your Faucet model’s replacement part list to determine the correct replacement part number(s). Contact MOEN at 1-800-Buy-MOEN or 1-800-289-6636 for further assistance.
3
Problem
Specific Issue
Typical Cause(s)
Possible Solutions
Contacting MOEN
Water
Temperature
Water temperature is not HOT enough on
tub shower units
Hot water may not be supplied to
the valve, a balancing spool may
be stuck or the temperature may
be calibrated not to allow full hot
water (up to 120 degrees
Fahrenheit).
If external shut off valves are
present, verify they are opened all
of the way. It is extremely
important that the units have both
hot and cold water supplied to the
inlets of the valve body. Also,
verify the hot water system in the
home is on.
Note: If comparing the
temperature of the water to an
adjacent lavatory faucet, you may
notice the temperature may not be
as hot (or as cold) in the
tub/shower valve.
Depending on your climate, the
incoming water (ground water)
temperature may fluctuate during
the year. This can cause the
overall hot temperature to
decrease (or increase) throughout
the year.
Posi-Temp Models
A. If the water pressure decreases when going from cold to hot, the 1222 cartridge would need to be
replaced.
B. Verify the handle rotates all the way counter-clockwise to a 9 o'clock position. If the handle stops
before this position, then the temperature limit stop will need to be re-positioned. Please view the
installation instructions for assistance on how to set this.
C. If the issue is still unresolved, replace the 1222 cartridge and flush the valve body.
For Further
Assistance,
MOEN U.S.
1-800-Buy-MOEN
(1-800-289-6636)
Moentrol Models
A. Inspect the 1423 balancing spool. This will appear on the front of the valve body, either to the right or
above the cartridge. It will look similar to a large flat head screw, and it will be brass in color about the
size of a quarter. A large flat-bladed screwdriver can be used to unscrew the balancing spool from the
valve. There will be a spool inside this piece, and it needs to move freely inside of its shell. If the spool
does not move freely, then the 1423 balancing spool will need replaced.
B. Verify the top of the handle rotates all the way to a 9 o'clock position. If the handle stops before this
position, then the adjustable temperature limit stop will need to be adjusted to allow the handle to rotate
all the way to the hot position. Please view the installation instructions for assistance on how to set this.
C. If the issue is still unresolved, replace the 1225 cartridge and flush the valve body.
¾" ExactTemp models
Note: For ½" ExactTemp valves refer to original service manual.
A. Make sure the temperature override button is being pressed in. If calibrated properly, the handle will
hit a stop at 105 degrees. In order to get warmer temperatures, the temperature override button needs to
be pushed in and then the handle will be able to rotate counter-clockwise to warmer temperatures.
B. Verify the stops are opened. The stops are located on the inlets of the valve, and they look like small
flat head screws. Use a flat head screwdriver to unscrew this counter-clockwise until you reach a stop,
this will ensure it is opened all of the way (screwing clockwise until a stop is reached will turn the water
off).
C. The cartridge may need to be calibrated. Instructions on calibration can be obtained via the
ExactTemp Service Manual. Please contact MOEN for the ExactTemp service manual at 1-800-Buy-
MOEN (1-800-289-6636).
ioDigital models
A. Make sure the temperature knob is being rotated to the hot side. The corresponding LEDs with light
red to illustrate this.
B. Verify that both shut off valves are in the open position. These will vary depending on your ioDigital
model.
C. Verify the hot water supply is attached to the hot water side and the cold water supply is on the cold
side. Feel the temperature of the inlet lines. If the hot is going to the cold side and the cold is going to the
hot side, the lines will need to be reversed.
D. Remove the valve inlet screens and inspect for any debris. The water supply will need to be shut off,
and then the black nut on the inlets can be unscrewed to remove the inlet screens. Rinse off any debris
that may be on these screens and reinstall.
E. The maximum temperature adjustment setting will need to be calibrated. This can be identified as a
blue dial on the valve labeled "Max Temp Adjustment" This can be rotated clockwise to increase the
maximum temperature (counter-clockwise will decrease the temperature).