Installation Guide

Installation & Servicing Instructions Rinnai Q-Series
73
Code Description Solution
Control unit error
1 Anticipation resistance wire not
present
When a power stealing room stat device is placed the connection terminal
needs to be provided with the special anticipation resistance wire.
2 Software error control unit. Replace the control unit. The controller will automatically load the program
into the new control unit.
Control unit error Incorrect data will be detected in case of a poor connection between the
control unit and the display. If necessary, replace the ribbon cable between
these two components.
The error persists after reset Replace the control unit. The controller will automatically load the program
into the new control unit.
High limit stat open Supply temperature too high. Caused by
- presence of air
- possible polluted impeller of the circulation boiler pump
- polluted internal fi lter
Check de-aerator. Replace when necessary the automatic de-aerator and
restart boiler for de-aerating programm (17min.)
Check water fl ow over system. Clean when necessary the pump and or
fi lter. Flush complete system
Check adjustment of balancing valves
Control unit error Replace the control unit. The controller will automatically load the program
into the new control unit.
- T3 fl ow sensor ground
connection
- T3 fl ow sensor failure
- controller failure
Check the data in Error mode. Boiler data during error:
1 Error = 14
2 Operational status = 00
3 Flow temp. = -22
4 Return temp. = xx*
5 kW burner = 00**
6 % pomp = xx*
* = variable values
**= x3415=BTU/hr
A temperature of - 36 is displayed at position 3.
Check the wiring and/or measure the resistance of the fl ow sensor. The
resistance should be approx. 12 kOhm at 77°F.
(See table in Appendix B)
If necessary, replace the fl ow sensor
- Thermostat indirect tank failure Replace thermostat by sensor T3 (with cable) for indirect tank
Signal maximum fl ow water
temperature exceeded (T
1
>
212°F).
check actual fl ow temperature. suddenly increase caused by completely
hydraulic shut off of the boiler (fi lter, pump, thermostat valve, service
valve)
check fl ow sensor NTC1. measure the resistance value (see Appendix B)
exchange defective part if necessary.
Change control unit when error persists
Signal maximum return
water temperature exceeded
(T
2
>212°F).
check actual return temperature. Increase of temperature caused by
external heating source?
check return sensor NTC 2.
measure the resistance value (see Appendix B)
exchange defective part if necessary.
Change control unit when error persists
T1 and T2 (swapped). T2 temperature is measured to be higher than T1. Check resistance value
of T1 and T2 (See Appendix B) and replace T1 or T2.
Controller failure Replace controller