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What do the status lights indicate?
In general, red LEDs continuously illuminated indicate the unit is attempting to self-correct a fault. Flashing red
LEDs indicate the unit has locked out in a fault mode. In this case, Emergency Heat will be activated. Call your
dealer for service after reviewing the specifi c fault information below:
Drain
When this light comes on, it indicates that the condensate drain pan within the unit has
reached the overfl ow level. This may be caused by foreign matter blocking the drain pan
opening, or a clog in the drain line. See page 34 for cleaning procedure
Water Flow
A sensor protects your unit against internal freeze up caused by a water fl ow loss in the
heating mode. When the WATER FLOW light is on, this signals that internal freezing condi-
tions have occurred. This may be caused by a pump failure, low antifreeze level or air
pockets in the loop piping (see resetting the unit section, below).
High Pressure
When this light is on, it indicates high refrigerant pressure. This may be caused by a loss
of water fl ow in the cooling mode or low airfl ow in the heating mode caused by a dirty fi lter.
Low Pressure
When this light is on, it indicates a loss in refrigerant pressure in the system. This may be
caused by a refrigerant leak (see resetting the unit section, below) or a dirty fi lter in the
cooling mode.
Airfl ow
When this light is on, it indicates either a dirty fi lter or an airfl ow problem. Clean/replace air fi lter. Contact your
WaterFurnace dealer if problem persists.
Status
A blinking green STATUS light indicates that the microprocessor control, which is the “brain” of the unit, is operat-
ing properly. If the light doesn’t fl ash but remains continuously on or off, the control is inoperative. Turn off all power
to the unit, including auxiliary heat, and then turn it back on. If the light remains continuously on or off, call your
WaterFurnace dealer.
DHW Limit
A sensor monitors the temperature of the water leaving the unit. The light will come on if the temperature is above
130°F (54°C). At this time your unit’s hot water pump will be de-energized to prevent excessive temperatures. Don’t
worry; hot water operation will resume when the tank cools off. This is not a fault condition, and the unit does not
require resetting.
DHW Pump Switch
When this switch is off, your unit’s hot water pump is manually disabled, and DHW OFF status light will be lit. This
switch may be used when the water heater is being serviced or replaced. This switch must be turned off when water
fl ow from the water heater to the unit is turned off or disconnected. Damage to the pump may otherwise occur.
If my unit shuts off, how do I reset it?
To reset the unit, repeatedly push the SYSTEM button on the thermostat until the display reads OFF.
The unit lockout indicator light will remain on for up to 15 seconds after turning the system off.
After the unit lockout indicator light goes out, turn the system back on to the desired MODE.
Unit operation should resume within fi ve minutes if heating or cooling is required.
The appropriate status light on the unit will continue indicating the fault until power is interrupted to the unit.
This serves as a diagnostic aid for your dealer.
If the unit shuts down again, call your WaterFurnace dealer as soon as possible. Do not repeatedly reset your
unit.
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FAQs, GENERAL INFORMATION & OPERATING TIPS
Status Lights
