12 error 18 – Rinnai E75CN User Manual
Page 78
Installation & Servicing Instructions Rinnai E-Series
78
Signal maximum flow water temperature
exceeded (T
1
> 212°F).
check actual flow
temperature
check flow
sensor NTC1
exchange defective
part if necessary.
Change control unit
when error persists
suddenly increase caused by completely
hydraulic shut off of the boiler (filter,
pump, thermostat valve, service valve)
measure the resistance value (see table)
Resistance table NTC-Sensors
15.2.12 Error 18
Temp
NTC 12K
°F
(12k:/77°F)
supply sensor T1
return sensor T2
DHW sensor T3
outside sensor T4
flue gas sensor T5
-4
98,000
-0.4
90,000
3.2
82,000
6.8
74,000
10.4
66,000
14
58,000
17.6
53,500
21.2
49,000
24.8
45,000
28.4
40,500
32
36,000
35.6
33,500
39.2
30,900
42.8
28,200
46.4
25,600
50
23,000
53.6
21,400
57.2
19,900
60.8
18,100
64.4
16,600
68
15,000
71.6
14,000
75.2
12,900
78.8
11,900
82.4
10,850
86
9,800
89.6
9,100
93.2
8,500
96.8
7,900
100.4
7,200
104
6,500
113
5,600
122
4,600
131
4,000
140
3,400
158
2,300
176
1,700
194
1,300
212
950