PROBLEM SOLVING
Mirage technical manual
page 58 of 65
Failure characteristics when the SSR load is continuously coupled
Element indicator light(s) remains lit
In a single phase, normal power, Duette the lower 2 heating spirals are paired (parallel) and fed by a
single SSR. In other Mirages, each heating spiral is fed by an individual SSR.
Figure P 5. Simplified heating circuits for Mirage Duette with two active heating spirals (above) and
Mirage Triplette or Duette high power with three heating spirals.
The heating spiral(s) connected to the failing SSR keep on heating, even when the indicator LED on
the SSR is not lit. The element indicator light will be lit continuously and boiler water temperature (and
thus pressure) will keep rising (unless you use an extreme amount of hot water). Eventually the
overheat safety switch is activated and/or the safety pressure valve will open.
Problem solving
Single-phase, normal power, Mirage Duette
The Mirage only has 1 SSR which you have to replace immediately.
Procedure to replace SSR
1. Turn mains switch
to “0”.
2. Remove left hand side panel.
3. Pull cover from SSR.
4. Remove all 4 connectors from the SSR.
5. Remove the 2.5 mm Allen bolts that hold the SSR to the heat sink. A heat transfer sticker is
applied to the back of the SSR, make sure that no parts of this sticker remain on the heat sink.
N
P
overheat
safety
switch
indicator light
heating spiral
SSR
ST25
P3
P2
P1
N
heating spiral
indicator light
overheat
safety
switch
SSR
SSR
SSR
ST25