UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
13.3 Troubleshooting for Flame Supervision System
To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads.
START
Connect a DC ammeter in series with the flame probe.
Is the flame present and at least 1 μA DC flame current?
Yes
Is there a current flowing in the flame probe circuit with no flame present?
No
Does “lockout” occur when there is a flame present?
No
Heater Operating
TROUBLESHOOT ENDS.
| Use General |
|
| |
No | Troubleshooting section to |
|
| |
| trace the fault. |
|
| |
| Is the connecting lead |
| Repair or replace as | |
Yes | damaged? Is the flame probe | Yes | ||
damaged or touching earthed | required. | |||
| components? |
|
| |
| Is inlet burner gas pressure |
|
| |
Yes | correct? Is live and neutral | Yes | Replace ignition control. | |
polarity correct? Is | ||||
|
|
| ||
| flame probe circuit correct? |
|
|
No
Repair or replace as
required.
If problems persist, contact
No | ||
|
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current
40
