PHP Resource Page

Technical Bulletins 

TB141001 – PHP-23A Heaters Controller – Voltage Drop

TB140201 – PHP-23A Heaters manufactured prior to 2013 – Control Unit Updates

TB140202 – PHP-23A, PHP-51W Heaters – Heater Serial Numbers

TB140701 – PHP-23A, PHP-51W Heaters – Blink Codes

Fault Codes Chart

PHP-20A Tech Manual

PHP Gen II – Air Heater Operating Switch Video

PHP-23A Manual

Timer Operation and Fault Codes

PHP Gen 1 – Air Heater and Engine Heater – 7 Day Timer Instructions Video

PHP-40A Tech Manual

PHP Gen II – Air Heater Operating Switch Video 

PHP-42A Tech Manual 

PHP Gen I Timer Instructions

PHP Gen 1 – Air Heater and Engine Heater – 7 Day Timer Instructions Video

PHP-51W Manual

PHP-51W Wiring Diagram

Timer Operation and Fault Codes

PHP Gen 1 – Air Heater and Engine Heater – 7 Day Timer Instructions Video

PHP-52W Tech Manual

PHP-52W Operating Switch

PHP-52W Engine Heater Operating Switch Video

Fault Codes Chart

Airtronic D2 / D4

Espar D2 D4 Manual

Hydronic 4/5

Espar Hydronic 4 and Hydronic 5 Manual

AT2000ST

AT2000 Parts

AT2000STC

AT2000 – STC Parts Breakdown

TSL17 (Thermotop C)

Thermotop C Parts Breakdown

PHP Gen 1 – Air Heater and Engine Heater – 7 Day Timer Instructions

PHP Gen II – Air Heater Operating Switch

PHP-52W Engine Heater Operating Switch