Rinnai E50C Installation & Servicing Instructions Manual page 70

Code Description
contact for return sensor T2
open
Control unit error
Control unit error
Electrical leakage to ground.
No software present
Flue gas temperature to high
(adjustment parameter 84 -
default 212°F)
Fuse on controller PCB
defective
or
Cable transformer not
connected
70
Solution
Check the data in Error mode. Boiler data during error:
1 Error = 37
2 Operational status = 00
3 Flow temp. = xx*
4 Return temp. = -22
5 kW burner = 00**
6 % pomp = xx*
* = variable values
**= x3415=BTU/hr
Check the wiring. check the wiring for the sensor
The wiring is OK but the error is repeated. Remove the plug from the fl ow
sensor as a result of which Error 32 occurs
Replace the sensor.
Software error control unit. Replace the control unit. Remove the E-Prom
from the defective control unit and place it onto the new control unit .The
controller will automatically load the program into the new control unit.
Software error control unit. Replace the control unit. Remove the E-Prom
from the defective control unit and place it onto the new control unit .The
controller will automatically load the program into the new control unit.
Moisture on controller PCB. Check if there is water leaking on or in the
boiler.
Stop water leak and replace controller.
Remove the E-Prom from the defective control unit and place it onto the
new control unit .The controller will automatically load the program into the
new control unit.
Replace fl ue sensor or adjust parameter 84 to default
Replace fuse.
A 4A and 5A spare fuse can be found on the back side of the Control
Tower.