Did you ever wonder why a 2x4 is recommended for the GDO reversal test or can devices other than photo-eyes be used with redidential GDOs or what should be done prior to installing a GDO--these answers and more can be found by reading DASMA TDS 369.
Professional dealers should follow this link for Guardian Return Policy and Procedure Guidelines.
/sites/default/files/Guardian%20Return%20Policy%20and%20Procedures_1.pdf
If photo-eyes are the suspected source of the problem, there is an easy way to troubleshoot the issue.
Follow the link.
https://www.dropbox.com/s/p648ultedzfganc/PE%20Troubleshooting%20Steps.pdf?dl=0
Follow the links to read an informative article about garage door opener installation.
Top 10 GDO Installation Errors: https://www.dropbox.com/s/5mgsjfbigj60lsq/TOP%2010%20GDO%20installation%...
Mar. 1, 2022 Edition. A downloadable booklet with replacement parts, part numbers and explosion views of all Guardian garage door operators.
Click on link: https://www.dropbox.com/s/z877x85tyuiejly/220301%20Replacement%20Parts%20Book.pdf?dl=0
Follow the link for detailed instructions..
How to replace a circuit board on a model 628: /sites/default/files/628%20Circuit%20Board%20Replacement%20Instructions.pdf
The following article details how to modify a Guardian Model 628 to operate efficiently in an RF environment.
The following article details modifications made to a Guardian Model 628 to operate unimpared in an environment with radio frequency interference. Please follow the link below for full details.
