

Ships same day if ordered by 12 pm
Manufacturer pricing rules prevent us from advertising our discount — no account or email required to see it.
Secure Payments
Easy Returns
Expert Advice
Fast Shipping
The Sealed Unit Parts Co HL503 is a gas furnace limit switch that ensures proper temperature regulation within heating systems. It plays an important safety role by monitoring the internal furnace temperatures and initiating responses based on set temperature limits.
The HL503 provides precise temperature control that helps maintain optimal furnace performance. When temperatures exceed one hundred ninety degrees Fahrenheit, the switch opens, preventing overheating. It then recloses at one hundred fifty degrees Fahrenheit, allowing the furnace to return to normal operations.
Thanks for subscribing!
This email has been registered!