GBT A2-035, Installation & Operating Instructions Manual

Page: 26 / 45

Page 25
SYMPTOM POSSIBLE CAUSE CHECKS & REMEDIES
Short Cycling (Unit
Turns ON And OFF
Every 30 seconds Or
So).
Operating Aquastat Not
Installed
Install An Operating Aquastat Or Boiler Sequencer To
Control The Water Temperature
Operating Aquastat
Installed In The Wrong
Location
For a Storage Tank Installation, Install the Operating
Aquastat in the Tank. Otherwise, the Operating Aquastat
Must Be Installed Upstream of the A2000 In A Place That
Will Have Constant Water Flow Across The Sensor
System Mis-Wired Or
Operating Aquastat
Has Failed
When The Desired Operating Temperature has Been
Reached, The 120 VAC Electrical Power Supplied To the
Appliance Should Be Interrupted. If The Power Is Not
Stopped At The Desired Operating Temperature, Correct
The Wiring Or Replace The Defective Temperature Switch.
The Unit Will Not
Operate
Pilot Burner Is Not
Being Lit
Refer to “Pilot Burner Not Lighting” In The Symptoms Listed
Below.
Pilot Lights But Main
Burner Will Not Come
On
Refer To “Main Burner Not Lighting” In the Symptoms Listed
Below.
No Power To The Unit Use A Multimeter To Check For 120 VAC Power To The
Unit When It is Supposed To Be Turned ON. Trace The
Interruption Of Power Back To the Source.
No Power To The
Transformer
Check The Manual Reset High Temperature Switch. Reset
Or Replace As Necessary
No Power To The
Ignition Module
Verify 120 VAC Power To The Transformer. Replace
Transformer If Needed.
TROUBLESHOOTING