INSTALLATION AND OPERATION INSTRUCTIONS
5-8
TANKLESS WATER HEATER 199
F040
Cabinet temperature sensor open.
•
Verify wire harness connections at cabinet
temperature sensors and control module are tight.
•
Check resistance of cabinet temperature sensors,
replace sensor if open circuit is found.
•
Check resistance of cabinet temperature sensors at
control module harness connector, repair wire harness
if open circuit is found.
F041
Cabinet temperature sensor short
•
Check resistance of cabinet temperature sensors,
replace sensor if short circuit is found.
•
Check resistance of cabinet temperature sensors at
control module harness connector, repair wire harness
if short circuit is found.
F042
Cascade DHW not available
•
Resolve any other lockouts in the cascade system
•
Verify Leader cascade parameter settings are correct
•
Verify Follower(s) cascade parameter settings are
correct
•
Check cascade communication status in the
information menu of both Leader and Follower
-- (Blinking)
Water presssure sensor fault
•
Verify wire harness connections at water pressure
sensor and control module are tight
•
Check resistance of water pressure sensor at control
module harness connector:
Black - Orange = 7.5 to 9.5 KΩ
Black - Yellow = 7.5 to 9.5 KΩ
•
If any resistance value is outside of these ranges,
check and repair wire harness open/short circuit
before replacing water pressure sensor