Performance Problems - Viessmann KRT 150 series Service Manual

Troubleshooting

Performance Problems

The boiler does not provide its original performance.
Performance
problems
Boiler temp.
ACTUAL <
Boiler temp.
TARGET
Yes
Exhaust
gas temp.
ACTUAL <
Exhaust gas
temp. limit
value
Yes
Residual oxygen
ACTUAL
Residual oxygen
TARGET
Yes
Fuel < W35
Yes
Open
primary
air vent
Yes
Check that
grate vents
move
smoothly
Yes
Contact Viessmann
20
1 Check settings
2 Heat cannot be dissipated
No
3 Check the function of the boiler
pump and the 3-way mixing valve
 F3 parametercontrol menu
1 Clean heat exchanger
No  F3 parametercontrol menu
1 Clean grate
2 Clean all four sight glasses and
No
pipes of the ember monitoring

system light barrier
3 Check the position of the light
barrier
 F3 parameter control menu
1 Use proper fuel
2 Close recirculation temporarily
No
3 Open ash chamber door that
is closer to the feed auger by
2" (50 mm) temporarily
1 Check air vent moves smoothly
No 2 Compare opening angle on the
operating console
3 Check electrical connections
1 Clean grate vents of cinder
coatings
No
2 Remove impurities
Pyrot Service & Maintenance
Boiler
Yes
re-establishes
Fault rectified
its performance
No
Boiler
Yes
re-establishes
Fault rectified
its performance
No
Boiler
Yes
re-establishes
Fault rectified
its performance
No
Boiler
Yes
re-establishes
Fault rectified
its performance
No
Boiler
Yes
reestablishes
Fault rectified
its performance
No
Boiler
Yes
re-establishes
Fault rectified
its performance
No