123
6.
Check the connections on the heat-
ing water and DHW side for contam-
ination and scaling; if required,
replace the plate heat exchanger.
7.
Install in reverse order with new gas-
kets.
Checking the temperature limiter
If the burner control unit cannot be reset after a fault shutdown, although the boiler
water temperature is below approx. 75 °C, check the following:
1.
Pull the leads from temperature lim-
iter
A
.
2.
Check the continuity of the tempera-
ture limiter with a multimeter.
3.
Remove the faulty temperature lim-
iter.
4.
Coat the replacement temperature
limiter with heat conducting paste
and install it.
5.
After commissioning, press reset but-
ton
R
on the control unit.
Troubleshooting
Repairs
(cont.)
5457 552 GB
Service
Summary of Contents for FS2B
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