Robertshaw 780-845 Ignition Module

When the thermostat calls for heat the 780-845 control simultaneously initiates ignition sparking and opens the pilot valve portion of the gas valve. Pilot flame recognition stops ignition sparking and opens the main valve portion of the gas valve. Pilot burner flame is continuously monitored at a synchronous frequency for the duration of the heating cycle. Should the pilot flame fail during the heating cycle the control will shut off the main valve until the pilot flame is established. The 780-845 lockout ignition control provides 90 seconds of spark followed by a 6 minute time delay purge between ignition attempts. After three tries if no pilot flame is sensed the control goes into a one-hour lockout period. At the end of the lockout period if the demand for heat is still present the unit will repeat the three tries for ignition. During lockout you may override the auto-system and manually reset the unit at the thermostat. The green diagnostic LED will be on continuously for normal operation. The LED will be off for internal lockout and will flash continuously for problems external to the control ie. not sensing flame.

Order Processing: After your payment is authorized and verified, we will start processing your order and this process can take from 1 to 2 business days, so please be patient with us. If we are unable to process your order due to inaccurate or incomplete payment or incorrect address information, your order processing may be delayed.

Carrier: UPS/FedEx/USPS. Delivery Timescale: More than 90% of orders arrive in 10 business days after despatch.

FREE RETURNS on all orders!
The following conditions must be met:

1. Items must be returned within 30 days after the purchase date.
2. Items must be unworn, undamaged and in original packaging.