Page 35
Faults
Problem
Remedy
Viking will not show any information
other than room temperature on the
display. The <F2> button does not
work.
Viking clock is set to “0” in installer menu so Viking is
locked into Manual mode. See
“Change Display
Settings” on page
19 of this manual.
Real Time Clock loses its time when
power is removed.
A small lithium battery designed to maintain the real
time clock during power outages may require
replacing once every 3 to 5 years. (Part number
CR1220 or equivalent). This is on the main Viking
printed circuit board and requires the removal of the
plastic enclosure to replace.
Economy function is not working
The economy function requires configuring to meet
the needs of the project before it can function.
Detailed guidance on the economy function can be
found on page 27 of this manual.
How can I test the economy function
is working?
In the economy menu, set Ec
onomy mode from “ON”
to “TEST” using the up/down buttons then select
save. See page 28
The red heat LED or blue cool LED is
flashing - there is no heating or cooling
output.
The Heating and Cooling LEDs will flash when heating
or cooling is required but the Viking cannot satisfy the
demand until the compressor anti cycle delay timer
has expired. “WAITING” is normally displayed in the
LCD during this timeout period.
The Viking is running at night when
you believe it should be stopped.
Check the real time clock is set correctly paying
special attention the AM/PM setting.
Check the schedule by using the <F2> button. Ensure
the start program event time is earlier than the stop
program event time.
Check to see if any setback temperatures are set.
See page 15.
Check the Auxiliary input settings as there may be a
time clock “override” wired into this input. See page
19.
