Checking The Secondary Circuit Temperature Limiter - Viessmann Vitosorp 200-F Installation Instructions For Contractors

Checking the pressure sensor
7.0 0.7
5.0 0.5
3.0 0.3
1.0 0.1
-0.1
-1.0
20
0
10
Value in "Diagnosis"
Fig. 66
Permissible range
A

Checking the secondary circuit temperature limiter

For the installation position in the appliance, see dia-
gram on page 103.
If the burner control unit cannot be reset after a fault
shutdown, even though the secondary circuit flow tem-
perature is below approx. 75 °C, check the following:
1. Pull the leads from the temperature limiter.
2. Check continuity of the temperature limiter with a
multimeter.
(cont.)
Fault "E6"
40 60 80 100
30 50 70 90
A
120 140 160
110 130 150 170
3. Remove faulty temperature limiter.
4. Coat the new temperature limiter with heat con-
ducting paste and install it.
5. After commissioning, press reset button R on the
Vitotronic control unit.
6. If the fault persists:
Check high limit safety cut-out.
Maintenance
180 200 220 240
190 210 230 250
109