HTP Boiler: Check thermostat circuit for stray voltage
Check thermostat circuit for stray voltage on a HTP boiler: Common wiring fault with zone valves.
Applies to: EL-80, EL-110, EL-150, EL-220, EL-299, EL-399 (N/LP)
How to fix check thermostat circuit for stray voltage: step by step
- Disconnect the two thermostat wires from the boiler
- Meter across them with thermostats and zone valves closed one at a time
- There must be no voltage
- Fix external wiring if any voltage shows
If the unit shows an error code, look it up: HTP Boiler codes
Models
EL-80 LPEL-80 NEL-110 LPEL-110 NEL-150 LPEL-150 NEL-220 LPEL-220 NEL-299 LPEL-299 NEL-399 LPEL-399 N
Source: Elite EL-80 N Installation Manual (LP-293), p. 51. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.