Do you have a question about the 3216 and is the answer not in the manual?
Questions and answers
Greg Askew
February 28, 2025
We have replaced a 3216 controller like for like. The old controller only got to ~420 C when it would say sensor broken. The new controller measures temperature, OP1 is indicated on the display however the furnace does not heat up. No alarms or messages. Set 1 KCHC0, Set 2 XXXXT
1 comments:
Mr. Anderson
February 28, 2025
The Eurotherm 3216 controller may display OP1 without heating the furnace due to several possible reasons:
1. Faulty Output Relay/SSR – The controller may be signaling output 1 (OP1), but the connected relay or solid-state relay (SSR) may be defective or not switching the power to the heating element.
2. Wiring Issues – Incorrect or loose wiring connections between the controller, relay, and heating element could prevent power from reaching the heater.
3. Blown Fuse or Power Supply Issue – A fuse protecting the heating circuit may be blown, or there may be a power supply failure preventing the heater from receiving power.
4. Incorrect Output Configuration – The controller settings may not be correctly configured for the type of output module being used (e.g., relay, SSR, or analog output).
5. Heater Failure – The heating element itself could be damaged or broken, preventing heat generation even though the controller is signaling OP1.
6. Safety Interlocks or Alarms – A safety interlock or alarm condition (such as an over-temperature alarm) may be preventing the heater from operating despite OP1 being active.
Checking these possible causes systematically should help diagnose and resolve the issue.
Need help?
Do you have a question about the 3216 and is the answer not in the manual?
Questions and answers
We have replaced a 3216 controller like for like. The old controller only got to ~420 C when it would say sensor broken. The new controller measures temperature, OP1 is indicated on the display however the furnace does not heat up. No alarms or messages. Set 1 KCHC0, Set 2 XXXXT
The Eurotherm 3216 controller may display OP1 without heating the furnace due to several possible reasons:
1. Faulty Output Relay/SSR – The controller may be signaling output 1 (OP1), but the connected relay or solid-state relay (SSR) may be defective or not switching the power to the heating element.
2. Wiring Issues – Incorrect or loose wiring connections between the controller, relay, and heating element could prevent power from reaching the heater.
3. Blown Fuse or Power Supply Issue – A fuse protecting the heating circuit may be blown, or there may be a power supply failure preventing the heater from receiving power.
4. Incorrect Output Configuration – The controller settings may not be correctly configured for the type of output module being used (e.g., relay, SSR, or analog output).
5. Heater Failure – The heating element itself could be damaged or broken, preventing heat generation even though the controller is signaling OP1.
6. Safety Interlocks or Alarms – A safety interlock or alarm condition (such as an over-temperature alarm) may be preventing the heater from operating despite OP1 being active.
Checking these possible causes systematically should help diagnose and resolve the issue.
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