ECO ULTRA Electric Boiler
Installation, Use and Care Manual
(Revision June 2017)
, Page
27.
-Some heating elements are
defective
-The total capacity of the boiler is
expelled
to
the
heating
distribution
system
at
this
temperature.
-Replace defective elements
-If a higher boiler water temperature is
required to satisfy the heat demands of
the thermostats, a boiler having a
larger capacity is required.
Boiler stays in demand even when
the thermostat is not in demand.
(Systems with more than one
thermostat)
-On systems with electric zone
valves, one or many end
switches included in the valve is
defective.
-A jumper has been installed on
terminals TT of the boiler
-
Change defective “end switch”.
-Make appropriate connections as
shown in fig.7
An overheated plastic odour is
released from the boiler
Turn the power OFF to the boiler.
Open the front and left side panel
of the boiler. Check the
components and electric wires
for indications of overheating.
Replace overheated components and
check supply voltage to the boiler.
Boiler safety valve is leaking
-Pressure reading at the indicator
shows a pressure above 28psi
-Pressure is below 28psi
-The pressure regulator on the
distribution system is defective or the
expansion tank is too small or
defective.
-Replace the safety valve
Table 7: Resistance value of the outdoor sensor vs outdoor temperature
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
°F
°C
Ω
°F
°C
Ω
°F
°C
Ω
°F
°C
Ω
-50
-46
490,813
20
-7
46,218
90
32
7,334
160
71
1,689
-45
-43
405,71
25
-4
39,913
95
35
6,532
165
74
1,538
-40
-40
336,606
30
-1
34,558
100
38
5,826
170
77
1,403
-35
-37
280,279
35
2
29,996
105
41
5,21
175
79
1,281
-30
-34
234,196
40
4
26,099
110
43
4,665
180
82
1,172
-25
-32
196,358
45
7
22,763
115
46
4,184
185
85
1,073
-20
-29
165,18
50
10
19,9
120
49
3,76
190
88
983
-15
-26
139,402
55
13
17,436
125
52
3,383
195
91
903
-10
-23
118,018
60
16
15,311
130
54
3,05
200
93
829
-5
-21
100,221
65
18
13,474
135
57
2,754
205
96
763
0
-18
85,362
70
21
11,883
140
60
2,49
210
99
703
5
-15
72,918
75
24
10,501
145
63
2,255
215
102
648
10
-12
62,465
80
27
9,299
150
66
2,045
220
104
598
15
-9
53,658
85
29
8,25
155
68
1,857
225
107
553
