CP-1605
•
Supply water temperature set too
low or not calibrated properly;
check water temperature. In the
case of water heater; if the
temperature has been set low
because of homeowner
preference, it may be necessary to
install an anti-scald valve to
control the faucet temperature and
raise the operating temperature of
the water heater.
•
Restrictions in heating loop;
remove restrictions, check valve
stuck, isolation valves too
restrictive, left partially closed after
purging or closed valve.
•
Water heater supply temperature
is unstable. Check water heater
setting.
Cold water at hot faucet
When heat source is a water heater, the
most probable cause is reverse flow
through the heating loop from a stuck
check valve; repair or replace valve.
Fan runs for cooling but not heating
•
Room thermostat may be
connected improperly. Refer to
Electrical
section or wiring
schematic on door of air handler
for proper installation.
Heating during Standby Mode
Probable cause is thermal siphoning.
See check valve description for details;
repair or replace check valve. Check
elevation of air handler above water
heater to see if motorized valve required
for positive shut-off.
