Troubleshooting - Viessmann Vitogas 050 ECD Series Installation & Service Manual

INTERMITTENT PILOT IGNITION – TROUBLE SHOOTING GUIDE*
Trouble
Pilot will not light
Main burner will light and turn off again
within safety timing of module
* Never leave a safety control bypassed. Only qualified service technicians shall perform troubleshooting procedures.
Parts List for Honeywell Intermittent Pilot Ignition System
GAS CONTROL LIST
Gas Valve ECD
Ignition Control
Pilot Burner * 1
Pilot Orifice
* 1 Pilot burner has ignition cable permanently attached.
Consult your Viessmann representative for parts replacement.
Cause
Air in gas line
Boiler temperature too high (adjustable
high limit aquastat activated)
Room thermostat setting too low
No power
Manual reset aquastat activated
Pilot burner defective
Pilot orifice clogged or defective
Faulty ground connection from burner
to module
Gas valve knob in "off" position
No gas, or gas supply has been
temporarily interrupted
Ignition module defective
Gas valve defective
Blocked vent switch activated
Flame roll-out switch activated
Defective igniter/sensor
Defective module
Faulty ground wire
NATURAL GAS
HONEYWELL PART NO.
VR8204P1007 (ECD-65 - 180)
VR8304P3308 (ECD-200)
S8600H1006
Q3451A2012
.018 inches dia.
390686-4
BCR 18
Cure
Purge air from gas line
Wait for boiler to cool down below
aquastat setting
Increase setting
Check power supply
Wait for boiler to cool down. Reset
aquastat
Replace
Replace pilot orifice
Replace ground wire
Turn knob to "on"
Check position of main gas shut-off
valve or purge gas line of air
Replace
Replace
Chimney or vent obstruction needs to
be removed
Clean heat exchanger
Replace
Replace
Replace
PROPANE GAS
HONEYWELL PART NO.
VR8204P1049
S8600H1006
Q3451A2012
.014 inches dia.
390696-24
BBR 14
17