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GLOWWORM 18SXI PUMP STOPS AFTER BOILER REACHES TEMP. PUMP STAYS…

Customer Question
GLOWWORM 18SXI PUMP STOPS AFTER...
GLOWWORM 18SXI PUMP STOPS AFTER BOILER REACHES TEMP. PUMP STAYS OFF BOILER FIRES AND OVERHEATS.PHONE GLOWWORM TEC LINE, FITTED MAIN PCB & SMALLER PCB.STILL HAVE SAME FAULT
Submitted: 8 years ago.Category: HVAC
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Answered in 4 hours by:
6/27/2010
HVAC Technician: Phil, Mechanical Engineer replied 8 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,798
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
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Phil :

Hello

Phil :

Thats tricky... those were worthy tries with the PCB board etc. Next item on the suspect list is the flow switch... the boiler should no come on unless there is water flow either DHW or the space heating section. Locate the flow switch, let me know if you have a multi meter to check it with, or are handy around electricity... we have several options regardless you skill set etc ...

Customer:

TWO PORT VALVE STILL OPEN ,STILL CALLING,PUMP SHOULD NOT BE OFF,WHAT WOULD SWITCH PUMP OFF. 230VOLTS STILL AT PUMP TERMINALS,I UNDERSTAND GLOWWORM SWITCH NEUTRAL SUPPLY TO STOP PUMP IF SYSTEM SATISFIED,BUT IT IS NOT. CAN RESTART BOILER BY RESETTING OVERHEAT STAT AND PUMP WILL RUN,BUT WILL HEAT TO TEMP,PUMP WILL RUN AS IF ON PUMP OVER RUN THEN STOP.BOILER WILL FIRE (TWO PORT STILL CALLING PUMP SHOULD BE ON BUT NOT, WILL THEN OVER HEAT)WOULD FLOW SWITCH TURN OFF PUMP WITH TWO PORT OPEN AND STILL CALLING.

Customer:

TWO PORT VALVE STILL OPEN,STILL CALLING, PUMP SHOULD NOT BE OFF,WHAT WOULD SWITCH PUMP OFF. 230VOLTS STILL AT PUMP TERMINALS, I UNDERSTAND GLOWWORM SWITCH NEUTRAL SUPPLY TO STOP PUMP IF SYSTEM SATISFIED, BUT IT IS NOT DHW STILL CALLING. CAN RESTART BOILER BY RESETTING OVERHEAT STAT PUMP WILL RUN AND BOILER FIRE.BOILER WILL RUN UNTILL TEMP SATISFIED GAS SHUTS DOWN, PUMP WILL RUN AS IF ON PUMP OVER RUN THEN WILL STOP, TWO VALVE STILL OPEN & CALLING PUMP SHOULD BE ON BUT NOT,BOILER WILL FIRE AND GO OFF VIA OVERHEAT STAT.WOULD FLOW SWITCH TURN OFF PUMP WITH TWO PORT OPEN AND STILL CALLING

Phil :

Hello again, if there is 230 volts at the pump terminals, and its a 230volt pump, the pump would be running uniess it or its capacitor arragement were defective...

Phil :

have you checked the capacitor and start winding switch on the pump motor?

Customer:

SORRY BOILER DOES NOT HAVE FLOW SWITCH. THE PUMP IS OK,GLOWWORM SWITCH NEUTRAL TO STOP PUMP. I HAVE BEEN IN TRADE SINCE 1963. WILL BE GOING BACK TO BOILER TO CHECK CONSUMER INTERFACE

Phil :

Hello again. I will opt out, please do not click the accept button. hopefully another expert here will pick this up, or you will figure it out youself.

Customer:

THANK U ANYWAY ALL THE BEST

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