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boiler service, boiler repair, emergency repair
Glowworm 23C Boiler Fault Codes
| Type of Fault | Check |
|
No domestic hot water or central heating (No flashing warning light on control panel) |
• 230V supply • Is fuse blown • Loose connections on control board (PCB) • Faulty control or interface board (PCB's) |
|
No domestic hot water or central heating (A flashing warning light on control panel) |
• Water pressure • Shortage of air or gas • Faulty temperature sensor • Overheating • Wrong flue length • Connections on air pressure switch (electrical or tubes) disconnected |
| No hot water but central heating ok |
• Loose connections at hot water flow sensor. • Faulty hot water flow sensor. • Faulty control board (PCB). |
| Component | Normal Measure | Check |
|
Gas control valve Resistance of coil 116Ω |
Under demand during ignition sparks: 24V dc for 1 to 2 seconds, then 12Vdc (constant) at the gas control valve electrical connection |
If 0 Volt: the gas control valve is not faulty. If 24 Volts and then 12 Volts but no gas at the burner: Check if the gas control valve is stuck. If not, check the stepper valve. |
| Adjustment valve (step motor) |
Close the gas inlet: Dismantle the step motor (screw not sealed in). Triger a demand and check that the valve opens during the ignition |
If the valve does not move: Check the connections at both motor and control board (PCB). Change the motor. Replace the control board. |
| Domestic water flor | To test: Use a new detector and connect it electrically in place of the faulty one. Blow through to simulate a demand for water. |