TESTING & TROUBLESHOOTING

MP-GS-10/20 Troubleshooting Guide

Use this chart with the appropriate wiring diagram, also found in this manual

Mechanical Control

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

 

 

 

Fan will not Run

No Power to Oven

Turn power on

 

No Power to Oven

Check Light circuit – IF OK, Select “Cook” and Check

 

 

Timer circuit.. IF OK, Check Door Micro Switches

 

Micro switch not OPENING

Check connections & switch functions..

 

 

(Caution: the switch components on this control

 

 

system pass 115 v.. a..c.. through switch contacts..)

 

Fast Control

 

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

Key Pad Buttons Not

Defective key pad

Use key pad diagnostics / pin outs test points

Responding

 

 

Loose ribbon connection at key pad

Check connection

 

PROBE ERROR in display

Faulty Probe

Replace probe

 

Loose probe connection

Check connections

 

 

 

HI TEMP In display

Oven at too high a temp for product

Allow oven to cool

HELP In display

Faulty Probe

Replace probe

 

Motor centrifugal switch stuck

Check centrifugal switch

 

 

 

 

Gas valve (s), or Ignition System

Check heat generation system – ( Refer to Service

 

 

procedures (Heat generation system) -..page

Unit will not shut off

Unit above 150°F

Put unit into cool down, open door slightly

No HIGH speed But LOW

Bad key pad

Use diagnostic KEY PAD TEST

speed works

 

 

Bad K2 relay on board

Check for voltage out of K2 relay

 

 

Bad motor

Check motor

No LOW speed But HIGH

Bad key pad

Use diagnostic KEY PAD TEST

speed works

 

 

Bad K2 relay on board

Check for voltage out of K3

 

 

Bad motor

Check motor

Display is BLANK NO

Bad transformer

Check for 24VAC out of TR1 transformer

POWER

 

 

Bad harness connection

Check connections

 

Unit will not heat

No power out of K4 relay

Check for power out of K4 relay

 

No power out of Ignition Module MV

Complete a flame current check to osolate

 

 

 

 

Gas valve shutoff switch open, PV, MV,

Check for MV power at gas shutoff switch, and that

 

or both valves stuck closed

PV and MV opens on call for heat

 

Motor centrifugal not closing

Check motor centrifugal switch

Motor stops, then after a

Thermal Trip on motor

Inspect rear clearance

period of time comes back

 

 

 

Motor air intake is clear of lint/debris

on

 

 

Replace motor

 

 

Page 46

Part # MPSM07 (03/24/08)

Page 46
Image 46
Garland MP-GD-10-S, MP-GS service manual Testing & Troubleshooting, Mechanical Control, Fast Control

MP-GS, MP-GD-10-S specifications

The Garland MP-GD-10-S and MP-GS are innovative electric pizza ovens designed for commercial applications, particularly in restaurants, pizzerias, and cafes. These ovens combine advanced technology with user-friendly features to deliver high-quality pizza quickly and efficiently.

One of the standout features of the Garland MP-GD-10-S is its dual-deck design, allowing operators to prepare two separate pizzas at once. This is a significant advantage during peak hours, as it enhances productivity without compromising quality. The MP-GS model boasts a similar configuration, promoting efficient cooking while also providing versatility in menu offerings.

Both models are equipped with powerful heating elements that ensure rapid heat-up times and consistent cooking temperatures. This technology is crucial for achieving the perfect pizza crust, as it facilitates even heat distribution across the cooking surface. The ovens also feature adjustable temperature controls, allowing users to tailor the cooking environment according to specific recipes or customer preferences.

The Garland MP-GD-10-S and MP-GS come with durable stainless steel exteriors, which not only contribute to an appealing aesthetic but also ensure easy cleaning and maintenance. The removable crumb tray further simplifies the cleanup process, allowing operators to focus on their culinary creations rather than time-consuming maintenance tasks.

Another notable characteristic of these ovens is their user-friendly controls. The intuitive interface allows staff to operate the ovens with minimal training, reducing the likelihood of errors and enhancing overall efficiency in the kitchen. Additionally, both models utilize a reliable digital timer for precise cooking times, ensuring that each pizza is cooked to perfection.

In terms of safety, the Garland MP-GD-10-S and MP-GS are equipped with sturdy door hinges and double-walled construction, promoting temperature retention and preventing exterior overheating. This design not only enhances safety in the kitchen but also optimizes energy efficiency, making them economical choices for busy food establishments.

Overall, the Garland MP-GD-10-S and MP-GS are exceptional electric pizza ovens that embody cutting-edge technology and practical design. Their combination of productivity, user-friendliness, and durable construction makes them a valuable addition to any commercial kitchen, catering to the demands of fast-paced culinary environments while ensuring top-notch pizza quality. Whether for a bustling pizzeria or a cozy cafe, these ovens are tailored to meet the needs of today’s food service professionals.