H2314700-
Waterpik Technologies
6000 Condor Drive, Moorpark, CA 93021 • 805.529.2000 • FAX 805.529.5934
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • FAX 603.335.3355
480 S. Service Road West, Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • FAX 905.844.2635
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 0502 Document 1192
FOR SERVICE
Contact your installing contractor, gas utility, Laars
dealer, or call Laars for the nearest authorized
representative in your area.
1G. Trouble Shooting – Fault Codes
The Endurance boiler uses an electronic boiler
controller that shows operation information and fault
codes in a three-character alphanumeric display.
Boiler Operation Information
default display = supply temperature, the temperature
of the water leaving the boiler heat exchanger
rtn =
return temperature, the temperature of the
water entering the boiler heat exchanger
tnt =
tank temperature, the temperature of the water
in the transfer tank (EBP only)
dt =
delta tee, the difference in temperature
between the inlet and outlet of the boiler heat
exchanger
Oat =
outdoor air temperature, the temperature at the
outdoor air sensor, if outdoor reset is used.
CSP = calculated setpoint, the calculated boiler
supply temperature, if outdoor reset is used.
Boiler Control Fault Codes
F1 =
Boiler control internal error. Switch off boiler
and restart. If F1 repeats, replace boiler
control.
F3 =
Gas valve status is on, with no call for heat.
This is an indication of a wiring error or a
seized relay. Check relay first, and then boiler
wiring.
F4 =
Supply sensor error. Check for damaged
wiring or poor connection first. Check sensor
resistance per installation manual.
F5 =
Tank sensor error (EBP only). Check for
damaged wiring or poor connection first.
Check sensor resistance per installation
manual.
F6 =
Return sensor error. Check for damaged
wiring or poor connection first. Check sensor
resistance per installation manual.
F8 =
Outdoor air sensor error. Check for damaged
wiring or poor connection first. Check sensor
resistance per installation manual.
LO =
Lockout. Many conditions can cause a boiler
lockout. See boiler manual for possible
causes and resolution.
OFF = Controller is off. Press and hold the upper left
(power) button on the boiler control for 3
seconds.
ICE = Low temperature protection – boiler has
detected water temperature below 39°F (4°C),
and will attempt to run the boiler’s circulator.
Correct low temperature situation to avoid
freezing conditions. Although the pump
attempts to run, the Endurance boiler cannot
prevent boiler or system freeze-up. When
water freezes, it expands, and this expansion
can burst pipes and cause damage to the
boiler, or to the pipes and components
throughout the whole heating system
