Notification Codes - Rheem 199,000 Btu/hr User Manual

5.3.2 Notification Codes

During operation the controller can also detect unusual situations and display a notification, usually without significant
interruption of the normal operation of the appliance.
These notifications are shown on the main display, and display only when an unusual reading is currently detected.
Once the error has been resolved, the operation will be restored
Note that these notifications only appear on controllers installed with software versions after 1.80. The software
version of the controller will appear upon the controller's initial start up.
NOTIFICATION DESCRIPTION
CODE
n030 DHW outlet temperature sensor
open/short
n040 Cascade communication lost
n041 Cascade system sensor open
n120 Maintenance recommended
Maintenance required, limited DHW
n121
output
Maintenance required, no DHW
n122
output
n150 High heat exchanger temperature,
limited output
High flue temperature, limited
n151
output
TROUBLESHOOTING
TANKLESS WATER HEATER 199
POSSIBLE CAUSE / SOLUTION
•
Verify wire harness connections at DHW outlet temperature
sensor and control module are tight.
•
Check resistance of DHW outlet temperature sensor, replace
sensor if open/short circuit is found.
•
Check resistance of DHW outlet temperature sensor at control
module harness connector, repair wire harness if open/short circuit
is found.
•
Verify Leader is powered on and 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.
•
Verify system sensor field wiring is terminated at the choosen input
(X13-3&4 or X13-4&5).
•
Check resistance of system temperature sensor, replace sensor if
open circuit is found.
•
Check resistance of system temperature sensor at control module
harness connector, repair system sensor field wiring if open circuit
is found.
•
Maintenance is recommended based on hours of use.
•
Maintenance is required based on hours of use.
•
DHW output will be limited until maintenance is performed.
•
Maintenance is required based on hours of use.
•
DHW output is disabled until maintenance is performed.
•
Verify all air has been bled/purged from the heat exchanger
central heating coil.
•
Replace internal pump if it is not operating during a central heating
demand.
•
Verify the unit has been converted to propane if operating on
propane.
•
Verify combustion readings at low and high fire are within
specifications.
•
Clean fire side of heat exchanger.
•
Clean heat exchanger central heating and DHW coils.
•
Verify the unit has been converted to propane if operating on
propane.
•
Verify combustion readings at low and high fire are within
specifications.
•
Clean fire side of heat exchanger.
•
Clean heat exchanger central heating and DHW coils.
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