Boiler Burner Cuts Off


Old 11-03-18, 09:42 AM
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Unhappy Boiler Burner Cuts Off

I have a Utica boiler with a Honeywell control. It has an intermittent but very annoying problem: sometimes the main burner has trouble lighting. When the problem occurs, the sequence is always the same:
1. The ignition control module activates the spark igniter which lights the intermittent pilot.
2. The spark stops, and the pilot stays on.
3. The main burner valve opens, and the main burner ignites for up to a few seconds.
4. The ignition control shuts off both the pilot and the main burner and restarts the ignition procedure.
5. After a predetermined trial period, the system shuts down and must be manually reset (the old Honeywell control would just continuously retry; the new one does 20 tries or 90 seconds trial for ignition, with a dipswitch to adjust to 15 seconds).
The suspected cause is a weak signal voltage through the flame rod. The flame rod, ground wire, spark wire, and ignition control module have all been replaced (control was updated to S8610u3009). The ground wire has been relocated as close to the burner as possible, using a 24k gold plated terminal at the control end, and at one point this fixed the problem for a few months. Once I think it gave a low input voltage code (8 flashes). There are three zone valves connected to the system and fed by the transformer; could that be affecting control? Should we replace or upgrade the transformer? This would involve replacing the main control or upgrading to a transformer with a higher amperage rating. Note: the ignition control module usually indicates 5 milliamps when it does manage to stay lit for more than a few seconds. Does anyone know if this is near the high end of its operating parameters?

Last edited by dome3; 11-03-18 at 09:44 AM. Reason: Paragraph return
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Old 11-03-18, 10:07 AM
Join Date: Oct 2013
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The transformer on that boiler is not made to power up zone valves. Zones valves need an external transformer for their power.

Depending on the zone valve you can basically put 3 zone valves on a 24V 40VA transformer. Taco ZV's draw the most, 3 is the limit. Honeywell is a little better.

The transformer on the boiler is there only to run the 24 circuit on the boiler.

Hope this helps a little.
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